Rme reputation has motivated my choice and my experience: Rme are ultra stable and very low latency. The converter is also quite clear from what I've had in the past. Noted no extraneous noise does not pass through the signal. I had a bad experience with the previous card in USB plug (background noise of a hub connected to another USB port or a USB cable just plug into my synthesizer)
I use my Rme only to record my moog synthesizer, or in the future, use of external analog effects in return.

UTILIZATION

The drivers are ultra stable, for now I have not seen better, and the team that made the drivers is very reactive! no problems with Mac OSX Leo!
I use with my RME, Ableton Live and Logic, the routing is very quick and easy. loopback function of the total mix is ​​very interesting!
Small flat for the RME Fireface UC (which has a dsp a little tired in the end). No way to have this effect the equalization or the babyface and UFX. it's a shame I did use the babyface!

GETTING STARTED

Connection, the intallation is fast: when you have little confusing switch in "Mac", but quickly set!
The card is easy takes over, the total mix of a huge opportunity, though a bit tricky at first!
Many people regret the lack of a manual in French (thankfully a Audiofanzine forumers of us share a great link to a manual in French!)

OVERALL OPINION

I use it for a few weeks! It remains to make some test to see if it suits me, but for now I'm happy.
The most interesting feature is the converter, which has the money, intended for the professional home studio. The presence of the adat of the word clock, the adat is a plus!
I try before 5 this model! Rme babyface is the one that still had the most satisfied, but it had some weaknesses that I can not find with the Fireface.
the price / quality ratio is excellent, although there are serious competitor in electronics such as tc (twin impact
, Konnekt 48)
I would definitely do it again this election with just under a dsp does not exist!