I've had my BB Passport for a couple of weeks now.
It's a strange form factor initially, but actually quite usable. Definitely a phablet, rather than a phone - but very usable and rapidly becoming the device I reach for in preference to a tablet.
BBOS10 still isn't quite up there with WebOS in terms of seamless integration (no synergy plugins, but some apps. do seem to add to the "share" menu quite cleanly). It accepted all my accounts without any problems and I even managed to get all my SMS messages transferred over using an app. from Preware and a paid app. from BB World.
The Blackberry Hub is OK as an integrated messaging concept, but I'd prefer to have separate messaging and email apps with integrated notifications which can be used to launch them. I'm also not a fan of how tricky the Hub makes it to drill down into a single account or a folder within that account - it can be done, but it's not as obvious as it was on WebOS.
The touch sensitive keyboard is clever and makes good use of gestures on it to launch extra features. Gestures on the screen are mostly familiar, although I miss being able to "swipe back". Having a back arrow just isn't same.
Minimised apps. appear in a sort of card view, but without stacks, and need to be tapped on to close them (got to hit the "X"), no throwing them away.
Inclusion of the Amazon App. store is a nice extra feature, and it's possible to get more Android apps. from Google Play using a third party app.
The "Q" devices are more like Pres, IMHO, and the forthcoming "Classic" may be even more Pre-like due to the OS it will run.
Not a hugely traumatic transition, but still not quite WebOS.