yea the v2 has the cheaper switches that could mean alot less clicks from all buttons than the "omron" of the pro version. So if you click alot or dont change mice constantly, pro should last longer and maybe feel better to press.
Reading through the ocn thread I feel a little disappointment but I will wait for some reviews to judge. Why didn't they used the 1600cpi lense in the pro version? Would make sense imo.