I just got my BB8800 2 days ago and I'm in love! LOL, I had a sidekick 2 prior to my MDA infatuation and its been love ever since. I was bored with my MDA though and was eager to try something different. So far I've been enjoying my new very expensive "toy". I do miss having a camera on my phone though. I'll get over it soon enough I suppose. Still trying to figure out some stuff like how to play around with mp3's and pix and wallpapers and themes and whatnot. Anybody else out there go from Windows Mobile to OS?
I think overall you'll be happy with the change. BlackBerry is the most stable OS out there for a mobile and the best, IMO.
Welcome to the forums, don't forget to check out the FAQ section and the Blackberry 101 articles for Blackberry basics and how-to guides. There are links in my signature.