Highly recommended! It's an excellent tool for getting good sounds for purposes of demoing a song for someone, AND also for making the final product if you don't want to spend time tweaking things manually. I was very surprised at the quality I got out of EZMix 2, with the Metal pack installed. It's just insane for metal drum tracks.
Remember though that you cannot edit the presets or create your own - there are only 2 parameters you can edit per preset, the rest is "hard-coded".