I have a Music XPC C2 and It is great. I don't know how much of the noise issues they resolved with this Rev, but it is quiet. I have absolutely no complaints about it. I'm a test engineer by trade, so when I got it, of course I tested her out. I loaded it up in Pro-Tools with 32 tracks of 24 bit stereo tracks, ran a few plug ins, and the CPU was somewhere like 40% capacity. I've pushed it pretty hard with no tracks and lots of plugins. I think i finally got it up there with (reason, sampletank, amplitube, Tracks, just about all the plug ins I could run). Probably took 20 of these plugins running in real time to clip the CPU. Tight little package, too.