In a word, awesome. I’m surprised by how intuitive it is. I’d read through the manual before it arrived, but haven’t spent that much time with menu-driven equipment. I was able to edit settings quite quickly and design/save a few patches for sounds that I wanted right away.
This is going to be a valuable tool for making music.
Bryan
I used the MP-201 on a recording session tonight. Things were a bit rocky, but I’m not sure if it was the MP-201 or the Pro Tools setup that should be blamed. A few times during the session the screen on the MP-201 went blank and it wouldn’t respond to the knob or buttons. Another time the computer locked up. After getting everything working in one Pro Tools session, we closed it and started another. At that point none of the MIDI communication worked.
Ultimately, we did get everything working (though I’m not sure what we ‘fixed.’). I was able to sync LFOs to the MIDI click and generate some cool effects from there.
Bryan
I assume you were using USB for MIDI? Sounds like a classic case of USB-MIDI-Fail. Try MIDI-DIN instead.
The few times I use MIDI I use the USB function. I’ve never had a problem. Perhaps mine is a case of beginner’s luck? 
Yep. We’ve had pretty good luck with MIDI over USB since then, but it is a bit picky. It’ll stay locked in a session for a while, but then will lose the clock.
Bryan