Logitech G700 is fantastic, just mind you have a look at
this thread.
I have two here at the moment; one is used by my mom, the other by me. The one she's using was my first unit that my uncle brought in from America, and after some months of use the left-tilt on the wheel suddenly stopped working. That ended up being a switch fault, so it still doesn't work now almost two years later, but the rest of the mouse works absolutely fine.
On my replacement unit, which Logitech sent me free of charge once they'd gotten the SN of my existing unit, even though I'd been asking them if I couldn't simply have it repaired or replaced somewhere seeing as the mouse was still working, just with the one non-crucial button not functioning... anyway. On the replacement, it has happened a few times that I'd get the click+drag issue with my
right mouse button on my G700. Every single time, nothing but opening the mouse up and getting some cat hair out from inside of it would resolve the issue for me.
So in other words, if you have cats/dogs around, you might encounter that issue form time to time. There are people reporting this issue on a few of Logitech's other modern mice as well, but w/e - it's a good mouse even if you run into this problem. Great key customizability, improves productivity an insane amount imo and just being able to switch tabs left/right AND do back/forward with the thumb buttons is already a major plus imo.