Re: Should I buy...
@ Fossa: the Machinedrum is in general a nice machine... but in my opinion, the sound is pretty distinct. So I guess it's a matter of taste whether you should buy it or not. Maybe the sampling function can compensate a bit (if you're not entirely satisfied with the synthesized sounds).
I would maybe get one if it wasn't so expensive
Maybe you can also check out the Jomox XBase 888 or 999, I think one of them has sampling functions as well. But the main drum sounds are analog, so you could compare what's best for you. I think they're in the same price range as the Machinedrum too.