There are a few really good sounding kits in there, and a few stinkers too (and a whole lot in between). I'm still on the fence on whether I like it or not as a sound module.
What percentage of the preset kits do you really like, Guinness?
Good question perfessor, but I don't know if I can answer it. I've been enjoying playing all the kits for the video, as it forces me to play 'em. But before that, I would usually just skip through most of them, and mostly play custom kits. I usually play with songs on my ipod. Mostly rock. Some country. And, while all bands have different sounding drums, I'm too lazy to try to create or pick a kit to match a particular band, and just play a the custom kit I like. I've only had this for about a month, so I'm still figuring things out.
Depending on what you plan to play, I think there are a lot of really good voices in this kit. Further, with the 3rd party kits due out sometime in the not-too-distant future, I suspect voice options will improve.
For the money, its voices and tweakability (capabilities) make for a really good value. Hard to pass that up.