BB10 is a great system.
Or at least it will be when it is finished. (Or would have been.)
It is still missing features I used at lot on the old BB system. (Though they have implemented many of the omissions that seriously annoyed me when I first bought my device).
I think the lack of compatibility with the old BlackBerry servers was a seriously bad move. (And the lack of compatibility for old apps too)
They really should have made the first few generations of BB10 devices dual boot with the old BB system.
I have bought Apps for BB6, playbook and apps and movies for BB10. (I also did for symbian).
I'm not buying into a new BB platform again (or Nokia for that matter). I don't see myself bothering with a new smartphone. I have an Android 10" tablet (which works as a phone too). If I ever need a personal pocket sized phone, then I will probably either go for a dumb phone, or an old BB or Nokia with a qwerty.