Well, I've not had a great deal of time to appraise this synth - but what I've heard I LOVE.
I already have many "analogue" VSTi's, such as the Pentagon (untouchable), JX Synth, Tau Pro etc. along with modulars (Reaktor, SynC). What I really wanted was good, "instant" sounds (especially acoustic) which didn't require too much arsing around with.
The pads are an obvious standout - those lovely "twinkling, shimmering" sounds which I'd previously heard only on hardware workstations.
Other highlights include the pianos and Symphony Strings (separate disc) - really nice.
My only criticism would be that some of the velocity layering seems abit meagre e.g. some sound like they only have a couple of layers.
Also some sounds have bugs (like extreme panning) but this will be fixed in rev 2.
Tech support is beyond reproach.
Docs are minimal but entirely adequate.
Sampletank interface is, ahem, functional. With the high quality and sensible effects I don't really miss all the tweaking of "real" samplers.
All in all real quality which sounds like it comes from people who really care about, er, sounds.