I have one and I am very happy with it. It can be programmed to send any MIDI CC on any channel, so it will work with pretty much any software that accepts MIDI CC messages.

I learned about it on the Sound On Sound forum (below), there are a couple of detailed reviews there. Hope it helps.

http://www.soundonsound.com/forum/showflat.php?Cat=&Number=1051518&Main=1047503