The thing about the ZEN is the AA and recoil tweaks you can do, plus all the other tweaks ( armor, ping, melee, slide cancel, etc etc) tons of customization if you are good on a controller and you take the time to really dial in settings you will destroy most anyone.
I have the ZEN, been using it since it came out and beta tested it. The M&K side of things is no way close, not even in the same stratosphere as the XIM when it comes to M&K playing.
But controller players will benefit massively. I am not good on a controller at all, and when I use the ZEN I end up been not bad with it.
But I am a M&K player, have been all my life and cant go past the XIM for that.
If the XIM worked with the ZEN now that would be amazing

But my Razer Tartarus and G502 don't register when I try to use them both