I've used a friends G502 for a bit, it was a bit too heavy and the braided cable felt like it was restricting movement. Plus I feel no mice over 2500 is worth it, they're designed to fail no matter what price you pay.
How much did you pay for it btw ? It was available for 1900 for the last two days on snapdeal, almost snagged one but I'm more interested in the G302 because of the smaller size.
I use a MX905. It costs 4.5k+ and is heavy (2 AA batteries). It is now 4.5 years old.