First of all, the sound is really, REALLY lovely. There is a small inconsistency when turning the knobs, some are more sticky, some are more loose. This does not bother me, but as this is a new high end unit, I just wanted to comment on it. The unit runs pretty hot and I´m quite sure it would´ve left a mark on my wooden table over time (the unit gets very hot, especially from under). So, I placed the synth to a stand with a metal tray (K&M 18819) and now everything is fine. The metal tray acts a bit like a heat sink, so the synth runs cooler as before.
My biggest gripe is the tune function (that autotunes all the parameters like pitch). Sometimes after tuning the sound gets distorted internally and the only way to get over this is trying to re-tune the unit or turn the unit off for some time. Then the sound is normal again. I quess it has something to do with heat? Especially when I had the unit on my wooden table the synth got distorted almost every time I tuned it. After placing the synth to a metal tray, I´ve had the distortion come up only once in the last couple of days. Going thru the forums, it seems I am not alone with this as some people are having similar issues. I tried resetting global parameters, resetting the tuning (heat) table, different cables and so on, but nothing seemed to have any effect on the issue. But as said, the synth has been stable (except that one incident) for the last couple of days, so lets see.
In conclusion, expect great sound, but possible heat related issues.
I have OS 2.0 installed (that came with the unit.).