must have if you use iOS
I highly recommend iCM. My studio consists of 15 + hardware units, as well as a PC "brain," a MBP, an iPad, and an iPhone. iCM has made the integration of the newer tech a dream. It's basically a swiss army knife for midi, in that I've used it with my Moog and my iPad. What is especially great is I can interface with other units without the need of a computer. My oxy 8 that has been gathering dust now has a use again, since Sunrizer's midi learn is so easy. I'm someone who prefers turning actual knobs, so this is quite exciting. I originally bought iCM strictly for use with Lemur, but the flexibility it provides was so much more than I had expected.
My only suggestion is better documentation, as it was a bit of guesswork getting everything to function correctly in Live. DAW specific instructions in the manual would solve this problem. Hardware communication was a no brainer.
I wait for the day when iConnectivity offers bigger units with more midi i/o. Highly recommended.