As of version 2.0 this app is starting to be as sexy as its interface. With a great collection of kits and effects this is a fun and easy way to get some grooves pumping out of your iPad. The quality of the kits and effects cannot be understated. Each of the 64 kits is unique and interesting. The 7 effects are global with up to two of them active at once, each with its own X/Y pad and Dry/Wet fader. The combination makes for some crazy dynamic fun; like having a classic drum machine and two Korg Kaosspads.
Unlike all of the other drum machine apps, however, it does not include Virtual MIDI sync, though it does provide support for WIST sync. It now supports AudioCopy to export your songs, but it does not allow any sample importing to make your own kits. Background audio is also now available, so at the very least you could use this to jam with a synth app.