I am very curious about this too. I've ben using Deck LE, and GarageBand looks similar, with a bunch extra built in goodies like loops and pre-amps. Anybody tried it?
I got to fiddle with it and its bigger brother Soundtrack at the Expo this week. Of course its not the same as having it at home with my setup but here is my initial take: 1) Excellent for people that are hobbyists and/or single instrument musicians. 2) Soundtrack has built in features for working with video, GarageBand is really music only (and at that more focused at guitarists). 3) The included sound libraries are pretty complete with lots of combinations of sounds. The search facility is REALLY nice. 4) The speed/slow features of samples have limited use since we all know you can only slow a sample so much before it doesn't sound right. 5) Soundtrack comes with a sample recorder/editor which you can use to build your own samples and loops. 6) From what I saw samples and loops were AIFF files but MIDI can be used (didn't get a chance to see it in action). 7) From what I saw, both are limited to producing stereo only recordings, no 5.1 or higher support. Which is not a big deal for most recording, but for video soundtracking it might be an issue. I think in the long run this will not be replacing my Edirol UA5/Deck LE/D-box/ZOOM pedal setup, it does a lot that I would never really use. I'd be more apt to upgrading to a full ProTools setup. Apologies if anything I am relaying is incorrect, sometimes hearing can be difficult on the show floor :) Cheers, Christoph PS. And on a completely unrelated note, the miniPods are cool but at the wrong price point...