Ignore the basic look/feel, this is high quality stuff.
Other drum synths on iPad are more style than substance. This may not have the slick UI that some other products have, but that actually works in its favour. The lack of distraction makes it unthreatening and easy to get to grips with. Once you delve into the feature set, it's incredibly powerful. And really, do you want to look at pretty rendered buttons all day or smash out crazy beats?