I want to update esc in one copter that have old common ones but this stuff updates so fast that I find new ones every time when I open HKing page, many of them specialized to racers now, like this one: http://www.hobbyking.com/hobbyking/store/__107765__Spider_Premium_Pro_30A_Opto_ESC_2_4S.html

How they performance on a 700kv 3s motors?, they have the advantage of lightweight, any disadvantage?

experiences? 

I wish to use with new Lihv 3s batts.