Plenty of power despite the diminutive size. Unmuffled, the kick drum is boomy and strong even though it's just 18 inches.
Probably a bit quiet for some live settings, but for recording at home, where I use it, it's ideal. And mic'ed, you could do anything with it. Fantastic bang for the buck, it outshines the twice-as-expensive Mapex kit that it replaced.
The stock heads, Remo UT, are not great quality, and I think the kick drum will benefit from a ported resonant head, but that's my only, very minor complaint.