Diva is the best sounding soft synth I've ever used. It has an incredibly musical sound.
It is good for analogue emulation to such a degree that I literally sold my analogue synth after buying it, as I couldn't see the point any more of hanging on to analogue gear. If you're looking for lush Seventies sounds, it's spot on. If you are looking for 80s stuff you can get there too, just about. Once you start trying to make modern dubstep basses and so on - no. Nor 303 sounds. But for anyone looking for Wendy Carlos, Vangelis or even Gong synths... you will be in heaven.
Diva became my favorite VST synth almost immediately. The sheer number of awesome presets is staggering. I have done nothing but play it for the last 2 nights. I am trying to get 10 posts on here because I want to write a review of it. not sure what number I'm on. anyway, if you have any question about whether you should get Diva, ask yourself the question: Do you have $10,000+ to spend on analogue hardware synths? No? Get Diva.
More knowledgeable users have said it all already. Diva is an incredible synthesizer, and by golly u-he even made a native Linux version. Works like a champ here on a multicore system running Fedora 21 with a realtime kernel. Thanks a million, Urs .