I bought this set as an upgrade from a low-end Zildjian set. I wanted something darker, and at least 15" hi-hats.
The choice was between this Sabian HHX Complex set and the Zildjian K Sweet set, but I finally chose to go with the Sabians. And I have no regrets!
The sound is deep and dark, but still a bit loud. I'm especially pleased with the 15" hi-hats! They also look so fantastic.
The only negative thing, I can think of right now, is that after only playing for two days, there is a lot of stick marks on the cymbals - but, that's not really an issue for me.