I.E Roccat Nyth/Razer Naga/G600
I had planned to buy a Roccat Nyth so I could bind some macros to its side pad, but considering the incoming prune, that might turn out to be useless.
In the meantime, I don't have access to the Legion beta, so I can't know for now, I could just wait for it and make up my mind once the expansion is out but i'm too curious.