I'm really diggin' it. When used in moderation, it can really add some nice smack to your drums or even some extra sheen/air to vocals. I would definitely suggest downloading the demo first as it's a plugin that's certainly not for everyone. Admittedly, I can't honestly say that I'll use it all the time. However, u-he is easily one of my favorite developers and I have no problem supporting the group's products.
On a sidenote: Urs informed me that can expect a very hefty update to DIVA in the near future including a dedicated arp/step sequencer...
Cheers.