
Also, you can currently get the adpaks and midipaks on sale at Big Fish audio (download).
I'll be getting the jazz brushes pack soon. The "brush sweep technology" is pretty cool; you can control the speed of the sweep, so it adjusts to whatever tempo you're playing.
I'm a long time EZ Drummer / Superior Drummer user, and I still will be using those programs. But AD does pack a lot of punch and you get a lot of value for your money.