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This is an expansion for either Toontrack's EZ Drummer or Superior drummer. It's loaded with toms and cymbals and everything I could ever want or need for composing metal or progressive stuff. It's all pre-processed, so using this for anything other than thrash metal, djent, or Dream Theater stuff is a bit awkward, but its punchy sounds and easy to use interface make it a key component of my studio rig.
Also, though I'm not 100% certain, I believe Deven Townsend used this program to create the drum tracks for his Ziltiod: The Omniscient album.