g502 is really nice yes.. but its kinda bad for shooters imo.. too heavy and too many buttons..
and to answer the question, no the g pro wireless does not have scroll click like the g502, i tryed both and honestly i think the g pro wireless is overrated for its price, i personally like g305 better
anyway the g502 will be good for alot of games but imo not shooters, dont bind a bunch of crap to ur mouse, u want ur finger on the trigger, not somewhere else, thats what the keyboard is for