I bought this for one reason, and one reason only - to be able to sequence a quick-and-dirty classic 808 beat and, for the odd time, sequence a 303 line, which are both difficult to approximate with other emulations out there.
That is all I use it for, and it does the job pretty decently. Gripes are that it doesnt have channel mute and solo, no fx routing, and most annoying of all, the otherwise excellent real time recording input pad plays your note input on loop in 16note intervals. The result is that single kick and snare input ends up doubling up, or worse, making a mess you have to clean up in the step sequencer. That renders it practically useless, and thats a shame as I dont think Ive found an accurate 808 emulated with what would otherwise be an excellent real time input controller.
In other words, this app would deserve a higher rating if some features were actually removed.