I agree with you spalding about the demo CD's. The one I got was about a year old and would have been OAS 5 or maybe 6.
I have got to listen to the Ikarus though with OAS 7 in it as a good friend of mine has one, although he lives quite a few miles away. The sounds were excellent and the styles were pretty good. Things like the Tyros 2 sound totally different to the Wersi though. The Wersi has it's own sound which you either love or hate but you must see it and play it to either appreciate or hate it. The problem in the UK is that they only exist in a few places as we all know and they cost an arm and a leg.