Dang, man. I use Vivaldi, so I assumed it would work for everybody /:
That kind of depends on how much tinkering you're willing to do. I personally love it. I switched from Chrome and I'm running it on Mac for some background. I like how fast it is and how the tabs systems work. Everything feels really nice to me and it is a beautiful looking browser. The biggest complaint I've heard is that there aren't any extensions; however, you can add most of the extensions from Chrome (e.g. AdBlock). If you want a perfect browser that is immediately useable, then this isn't for you. But I enjoy getting to play around with it, so I really like this browser. I feel it could eventually rival Chrome, but definitely not right now. Right now it's more akin to Opera (for obvious reasons) than anything else.