I got an mk3 mikro, around June 1. My main use has been with melodics on a Mac book, working on improving my rhythm. I wondered about it, at first, it is sensitive and of course the software does have to get sorted out. However, in general I've come to the conclusion that most issues have more to do with my touch than any hardware or software issue. In NI mode I've never had an issue. In midi mode, I've occasionally had to "pull the plug" to reset. However on those occasions, there has been more than one program in use (sequentially) and more than one midi device, over a couple of days. So, who knows what's to blame. So, in summary, the usual teething problems, but it seems to work well after that is all sorted out.
As with all this stuff, keep the receipt.
PS - Melodics has been very prompt, patient, and helpful with the email tech support.