Without a doubt the best piece of recording kit I've ever purchased. Superb audio and build quality, portable, works with Mac and PC, expandable... what's not to love?
Sure, RME's TotalMix software has a bit of a learning curve, but once you get the hang of it (which shouldn't take more than a couple of sessions for anyone reasonably used to working with a DAW), it's infinitely flexible.
With every other computer audio interface I've owned, there has always been something (or multiple things) I was simply unable to do, in terms of routing—but not with the Babyface.
At first glance it may seem expensive, but honestly, at this price: it's a bargain you won't regret investing in.