I bought my Tempest used a few months back after using a friend's for a year. I didn't update the software when I got it, bc it was at 1.4- Seemed really buggy and quirky, stealing voices even when I was using less than 6 with no choke assign, also lagging while synced to Beatstep Pro or DAW. I'd workaround by running things in solo'd and nudging regions. Not ideal, but I got used to it.
Just installed the new 1.4.0.15b update and its a whole new ball game. Runs and feels so much more solid to the point that I'm thinking now the OS that was in there must have been corrupt. Whatever they did worked. Admittedly I generally blow past most bugs as a part of the workflow and try not to get hung up, also wouldn't catch certain bugs because they don't affect the way I use it, but I would like to applaud the whole team at DSI and Roger Linn for even attempting this kind of box. It does it's thing in a unique way and though it takes time to make your sounds sound good, it's worth it. Finding really cool things on your way to something else is part of the magic of electronic music.
Great job folks.