I'm not sure if this will help, but a couple of weeks ago I picked up an Edirol FA-66.
There were problems with it when trying to monitor a mix and when recording a mic in (both in Live), despite my G4 being optimised for Live (power settings, RAM, free HD space etc).
The very helpful assistant at the Sound Centre in Oxford St (basement of Virgin) offered to exchange the unit as it may have been faulty. The replacements were on hold for other customers, but he gave me a really good deal on a Focusrite Saffire LE (which also comes bundled with lots of goodies

).
I got the LE home, plugged it in and it works fine. I'm very happy with it.
I'm new to all this, so the problems I experienced with the FA-66 could well have been to do with my handling of the device, but I Focusrite works and is the one for me!
It has been a little stressful trying to decide which audio interface to get, but it's over now!
Manufacturer's page -
http://www.focusrite.com/productdetails ... 3&iRange=5
(can't find Sound Centre's site I'm afraid)
Viva Live!
Viva Focusrite!
Viva Heath from Soundcentre!