FWIW, I finally had the opportunity to test it with my "old" Focusrite Scarlett, and it works fine, both for recording and playback.
It does seem prone to graphic corruption and glitches, but having not worked with the PC version, I can't say if it's an issue with this prototype. Actually, that kind of behaviour reminded me of the good old days of working with Sonar on a PC. :P
Of course, this could also be due to the fact that I'm running it on an older MacBook Pro. Still, that's a type of glitch I practically never encounter with other apps.