So it's turnable? Does that mean that you can like, swivel the mouse to swivel your camera? As far as disconnecting, I've never had any trouble with my mouse disconnecting and it seems just as responsive as the other version ever was. I've even got my keyboard on the same USB receiver with Logitech's unifying software. Never had an issue with transmission on a functioning mouse. I did once have the transmitter on one of my mice go bad. I took it apart (I've taken several m570s apart) and noticed that the transmitter didn't have a cover on it (they usually do) and seemed to have some hair stuck in it. I got rid of the hair and it connected again, but one of the extra buttons was bad so I got a replacement anyway. Might have been a coincidence with the hair, I don't really know. At any rate, unless the thing's quit working altogether I haven't had issues with occasional transmission problems.
I think you mean tunable? Mine is pretty fine-tuned at this point weight wise and all. I imagine the technology has gotten a lot better being that I haven't used a wireless peripheral in a really really long time. Maybe it's more I just never had a reason to have a wireless keyboard or mouse. All my major pieces of technology are close together.