The battery can be removed to reduce the weight, you can play wirelessly (8-11h intensive use, a battery costs go 15th on Razer Store if ever: p) can be changed by recharging the battery etc ...
Responsiveness is here! even wireless, nothing to say, ergonomics is great! Notice to left, do not take it: p
Being a razer addict, I highly recommend it, better than a razer naga for my taste if you are followers of the 5 buttons: p