I have one -
Wouldn't buy it again. Primarily because as a drum machine it's feature poor but too feature rich at the same time. It doesn't have the features you'll really want in a drum machine - lack of velocity sensitivity is a prime example - but does tons of stuff that you - well, at least, I - never use.
Yeah, its cool as a practice "helper," but it's not a pro drum machine and it's not a pro synth or sequencer either.
But, I do use it - primarily to trigger other synths.
I'd trade mine for an Alesis 16 or DM5 in a heartbeat....