I just got one and I'm so happy, I could cry.
It makes my Softsynths sound like my real Roland Synths, not really that odd considering Edirol is a devision of Roland.
I can't bleieve the quality, it sounds like equpiment I've used that costs several thausand, and do half as much.
So if anyone is trying to decide which to buy (as I was), out of the M-Audio Firewire 410 (~£260) or the Edirol FA-101 (~£360)... Go for the FA-101 it's worth the extra £100 for the stability of the drivers alone. The extra 10 channels are a bonus, and the audio quality from the Edirol outstrips the M-Audio by a factor of about 2.6 million.
This Matt is a happy chap.