Bought an X4/X2 set up for my Soda a couple of months back, after getting completely pissed off with my Oros. So far so good. They did 2 weeks in the Pyrenees with no issues straight out the box, and they've had one filthy ride so far and I finished with pad material still left, which is something of a revelation at the mo.
I'm with holding full judgement until I've done some more really wet shitty rides, as thats where I tend to have issues – pads lasting less than 10miles kinda thing.
Currently running with XO shifters, and it's OK, but I'm probably going to lash out on a set of rooster mountes for them.
18bikes have a whole load of setup videos on youtube which are well worth watching if you do decide to go the Hope route.