Ive got an Mbox2 but its a bit shite. Its got really bad latency or something so it takes about a second for the sound to start after you play, and it also decides to cut out about every half hour with only a 50% chance of working again without restarting the whole computer
. Ive been using it for recording and just as a soundcard to my stereo.
Ive got an ibook g4 and am looking for something similiar to the Mbox2 but actually decent(2 audio inputs, xlr + 1/4" jacks, midi i/o spdif etc)
firewire would be cool I guess.