Layering drums (X drum) and the built in pitch and envelop adustments, routing...the sound of the room mics. All make the product exceptional. The one thing I have found is that the HH are always mixed so loud, and you have to run to all the "open" mics to turn them down. Getting radical with the pitch change loses realism pretty quick, but is great for kicks and layering in with the snare...whatever. On my older system, it can sometimes take a bit to load on initial boot up.
The NY vol 1 and 2 are steller...imo the best expansions and looking to get NY 3 for myself in the future. And I think the metalheads love the Drumkit from Hell... I like the snares in those kits too. ping...ping...ping!!