In the run up to the first gig with our new set up I ended up going for the Alesis io2 USB audio/midi interface. On the upside it's small, light, cheapish and has midi included. On the downside it's noisy compared to the mbox, and I'm having midi issues.
Its plug and play on a mac, no drivers to upload, and so seemingly nothing you can do if it doesn't plug and play. Audio works straight off, MIDI is difficult. After a stretch where it sometime didn't work, sometimes did, but I never knew what I'd done right, i found that it only recognises the MIDI if you plug it in with the machine already running, but before you launch the program. What a faff. I can make it work, but i dont really want any 'secret handshakes' to be necessary when other people are using the kit in a stressfull giging situation. Can find nothing on the forums that relates to the mac. There was one person with exactly the same symptoms, but no answers. Seems this is a dead end.
Note: Find the 'Audio Midi setup' application in mac/applications/utilities
Might revert to the mbox one for walkabout rig.
I think it sounds better, I think it has better headroom for loud sounds, or perhaps it's that playback to headphone speakers is better. Also I want to know if the few random crashes I still have are to do with the alesis midi problem, the hackintosh or just the Dell itself.