Don't hold back now.
Let'r rip.
For everyday experience it's one of the better versions of Windows, definitely better than 8/8.1, though the Start menu is still less well designed than the one in Windows 7. But you have to accept some potentially very intrusive terms of service, you never really know what information it's disclosing about you, and it continues the trend of control over devices being taken away from users in favour of the hardware and software corporations and govermnents. Linux is a preferable OS and if you don't need Windows-specific software (or if you can get away with VMs or Wine) you won't be missing anything significant without Windows these days. Like many people though I'm stuck on Windows a lot of the time because of the software I use.
I came to the same conclusion as a satisfied Win 7 user but I put Mint on a Stick a couple of weeks ago and love it. Nice not to need Win 10 when 7 goes bye bye. In fact, I'm quite sure I'll be using Linux most of the time.
I use Windows as desktop OS, Xbox for gaming, Android on devices and Linux on server (and some desktop Linux too, mostly on a netbook as a writing environment, and in VirtualBox on the more powerful Windows laptop for random Linux-y things). Most of the apps I use regularly in Windows are open source, however, and have Linux ports. Overall, I like Windows 10, aside of small instability due to very minor driver issues (not bluescreened in a while though, and I hope it's a good sign). The only massive gripe I have is that the photo app is a bit slow and silly. Look, I'm a serious amateur photographer, and I'm constantly amazed by how bloody difficult it seems for folks to make a photo management software. Basically, the only solution that actually works for me is to stick the photos on a NAS and tell the application (read: digiKam, which isn't my first choice, but seems to be the only one so far that actually works in even remotely sane manner) to store every bloody detail on Exif/XMP/what-have-you. Because I guarantee that the nice "simple" photo management app you have at hand will try to store everything in a separate database that gets corrupted randomly or evaporates during upgrades (adn tehn u ar lik "omg where did my photo captons go oh nose"). Oh, and it absolutely insists that the image collection is stored at a very specific directory on your local hard drive. Or it makes an assumption that every single image file in your home directory is a photograph. Case in point, Windows 10 photo app first made the assumption that everything in Pictures folder is a photo, which is silly because I also draw and stuff, and applications tend to store image files there (I seriously thought the Windows 10 start menu tiles were showing some stock photos or something, until I realised my music player was caching artist and album images in Pictures folder). I could change the photo storage locations, and sometimes Windows even recognised that fact (it still kept adding random pics and I have no bloody idea how to remove them from the photo library. Gah! In short, I have no need for this particular photo manager because these photo managers don't fit my workflow. Which wasn't a problem in the past, because even if this kind of apps would ship with OSes I could simply choose not to use it. In Windows 10, they made things worse by integrating the image viewer and the photo manager. I'm seriously considering installing an alternative image viewer to do a thing the basic operating system tools fail to do. (Ah, back to the happy days of Windows 3.1 - not...) Oh and irony and ironies, while writing this post, I can't even experiment with the app or probe the settings because the application straight up refuses to start for some reason. Also there are small gripes that I have. There's been a whole lot of cool things here that I had in Linux ages ago (multiple desktops, woot - welcome to 1996, Windows!) but if I wanted one new feature in Windows, it'd be some kind of a sane update to Explorer to take advantage of all the cool stuff in file management that we've seen in, uh, last 10 years in other operating systems. (Just adding multiple tabs or panes would make stuff so much better, and it's kind of annoying that all of the third-party Explorer replacements are terrible too...) Just copying OS X 10.3 Finder to Windows Vista and then going resting on your laurels doesn't cut it, Microsoft... Oh, and the network drive access usability sucks too. Can I get some nicer bookmarks/shortcuts to CIFS drives? (There's probably power-user methods for these, but the user interface as it is is pretty cryptic.) Windows invented the damn CIFS thing, why is it so difficult to use it?
OK. Mostly does what is supposed to without being obnoxious. Not a fan of the start menu. I turned off web search from the start menu. The program and file results are ordered in a way that might be based on some weird priority from past file and file type use, but it must be using some assumptions that don't fit me. I don't like it. Win 10 continues the same "let's make imaginary folders mandatory" idea that win7 Libraries started. I like libraries in a couple specific cases, but in win 7 & 10 they get in the way more often than they are useful. Also my mom just doesn't quite understand them. If it can't be explained by nesting actual files and actual folders from her file cabinet, she doesn't want to bother with it, but she has added folders to libraries without realizing, thought she had accidentally copied and pasted again, deleted files from the library, and then been surprised when they disappeared from the original folder too. So they aren't powerful enough for me, and not mom-proof enough for her. The virtual desktops feature is an important step for Microsoft, bringing to windows a FUTURISTIC FEATURE that OSapple didn't implement until '07, Unix and Linux didn't start playing with until the early nineties, and Xerox PARC was so behind they didn't even think about it until the late eighties. Unfortunately, Windows' virtual desktop implementation feels gnome3ish, and I really prefer KDE. Windows does have some nice snap-to-edge-resize candy though.
I’m happy with it on my gaming PC and switched over to it as soon as it became available without any issues. I don’t see any reason why someone would use it on any other machine though, unless working in a company that lives in the Microsoft world. That being said, I think Microsoft is going in the right direction with their new products (surface pro 4, surface book), so staying on the ball might be worth it.
It seems most of the commenters in this thread are from an IT background (understandably). As a completely casual computer user, I love Windows 10. It has been just a small enough change that I know how to do everything without really having to learn anything new, but there are endless tiny improvements (much more pretty and functional Win+Tab / Task View feature, searching for your own applications is now superfast), and in fact everything seems to be running a little bit more slickly than on Windows 7, which is what I upgraded from. There really does seem to be a move to make a user interface which is totally suited to casual users like me who just want to get stuff done fast. I haven't tried out the Phone Companion yet, but that clearly sounds like the direction desktop OS's should be going nowadays - integration across phone, home computer, TV and possibly work computer. It really seems like Microsoft have worked out what the majority of everyday users actually want. If I have any criticisms, it's that there aren't any features where you think "wow, that's clever!"... like when I first tried out Google Now or Chromecast or remote access... there are no dramatically innovative features.
It's okay. Some minor improvements over 8, I like it about the same as 7. I still hate live tiles and the new start menu, using Classic Shell instead. My favourite new feature is the improved window snapping. I'm looking forward to the Threshold 2 update so I can get proper coloured titlebars. It did take quite a few settings changes and registry hacks to get things the way I wanted. Namely, disabling Windows Update seeding, OneDrive, and tracking. I too would rather use Linux but there are too many games that aren't supported and dual-booting is a hassle.
I've been a Mac user since OS 9. Until I got this PoS Dell because I was afraid my Macbook was going to bite it after five years and I couldn't budget in a Mac. I fucked up the trackpad software on Windows, because isn't Windows about the freedom to fuck up your OS, and was happily using Linux Mint until I got the 10 update. I installed it hoping it would fix my trackpad, it didn't, but it did render my Linux partition unbootable. I fixed the trackpad on my own. Linux is still borked and I had important files on there. The best thing I can say about Windows 10 is it isn't Windows 8.
Have a look at "system rescue cd". Basically, it'll let you boot into your linux installation (using a rescue kernel). Once there, just install grub again - it'll detect that windows installation and allow you to choose your os at boot time. http://www.sysresccd.org/SystemRescueCd_Homepage Alternatively, "Boot repair disk" may be able to do it for you automatically. Just give it a try.
I've used this successfully to repair a boot partition after a Windows re-install borked it. Always good to have a boot repair disc around just-in-case, if you're using a Linux bootloader.