I am looking up upgrade my almost 10 year old Logitech M510. The reliability of Logitech mice is amazing as I have had this mouse so long I've pretty much worn the rubber down to the plastic. It's not a gaming mouse, but I do not game with mouse/keyboard anyway not so much because of mice, but keyboards I find to be extremely uncomfortable for gaming with. If I do give mouse gaming a try I will probably use a single handed controller (like the PS3 Navigation controller, or Switch Joycon in the left hand, or maybe get an Orbweaver.
So far, I really like the G600 but the sensor in it isn't as good as their other mice. The G502 looks like a damn good mouse, but they don't seem the best suited to those with a "claw" grip. It'd be nice to find something a bit more modest shaped that still had the extra programmable buttons.
I would like to find something with 8 or more programmable buttons.