Anybody use GarageBand for Drum Corps/Marching Band work?

I'm not in Drum Corps or anything, but I used to follow that stuff when I was in high school marching band, and I got the idea that GarageBand could potentially be a pretty nifty way to arrange some of that kind of music.

Just wondering if anybody has done this? Any recommended Jam Packs/other instruments? Other experiences/pros/cons welcome!

Thanks!