The drums on this expansion sound great. They are all very punchy and raw sounding. The snare is also very pingy and ringy, which is going to help it cut through your mix which most likely has a big wall of distorted guitars in this genre. There are a good amount of different flavors to choose from, since you can switch out individual drums in the interface. The way the drums are recorded would probably limit them to the genres of hard rock and metal, I think they would sound very out of place in anything else. They do sound great for those genres though. The MIDI grooves are obviously programmed by a very accomplished metal drummer, and the fills are extremely impressive sounding.
I have had this for a year or so since I switched to the ezDrummer line of drum software.
This expansion is made exclusively for hard hitting metal drums that sound good when played fast and hard. Since drums for this genre are usually very fast and varied, programming by hand would be a real pain. Thankfully the pre-made MIDI grooves sound great and are varied. This will cut down the time you spend on getting your drum track up and running by at least half, since you can just copy out the main groove and just edit the stops and fills. I have used a lot of different drum samplers, and ezDrummer is consistently one of the best sounding ones, while always being the fastest and easiest to use. Great sounding metal drums at a low price. I'd definitely get this expansion again.