I just purchased one last week as well. I traded-in my MS20m module to get it. I loved the MS20m, but it always sounded like an MS20. The Matrixbrute is obviously much more versatile.
My first impressions are quite good. Build quality isn't lacking as far as I can tell. The sounds are great!
A couple criticisms I have are:
- I'm spoiled with the empty modulation slots in my P12, the MB only has 4. More would be nice.
- the sequencer could have a few more options (ratcheting, extra modulation tracks, separate tracks for each oscillator. )
All in all though, I'm quite happy.