it is better on every way than the already good g502: weight, size, comfort, cable, lighting, scroll wheel.
The only thing I don't like is the noise the left and right buttons make, it is too loud.
And one thing people complain is the feet, they are too small, I have not problems with that.
This mouse is for claw grip users (my hand size is 20cm), unless you have a small hand.
I want to say I didn't care about lighting before but the one this mouse has is really cool :)
5/5 Should buy, if you have a palm grip or fingertip go for the Logitech g403