I have used both the M-Box Fast Track Pro and the Presonus Firebox side-by-side. I was asked to assist in choosing what would be the standard issue interface to the students as a consultant to a local music school. We started with the Fast Track and the Firebox side-by-side. We recorded several sources [vocals, acoustic guitar, woodwind?] through each with both a dynamic as well as a condenser mic (if memory serves I was handed an SM57 as a dynamic for both musical sources and vocal sources, and an AKG C414B for musical sources and a Studio Projects C1 for vocal sources). If I can locate my specific notes on the results I’ll post more specifics, but the end result was that we opted for the Firebox. We did test an Edirol unit (not sure if it was the FA-66 or the UA-25EX). However, it was a bit of an after thought and was not tested under the same control. I guess to be completely honest then I can’t be 100% on my recommendation of the Firebox over the Edirol since I have never put the two side-by-side. Also, there were a few other boxes in the mix for the test, but I don’t remember exactly which – vaguely I’d say they were an Alesis, a Tascam, and perhaps and EMU.
I didn’t intend for my post to seem purely opinion with little empirical evidence. In the future I’ll attempt to more clearly define my reason for a particular preference.
And thanks for your many posts sharing lots of wisdom and experience with everyone here in the community. I’ve definitely gained from reading through your responses to different threads here.