Re: I got one!
Odd, I bought the 64GB version in september, it integrates just fine with CalDav and CardDav both on iCloud and my own hosted server. It is actually rather good that way.
One thing I've got against it is that the battery consumption on standby seems to be shocking. I'm sure it is probably my settings, but that should really be sorted out of the box.
Secondly, and more related to all 7" devices not just the playbook, I like reading on my tablet. I have large contracts, reference manual books, magazines etc. On a 7" device I just have to keep zooming in/out, I can't read a page of A4 comfortably, let along annotate the PDF with comments and return it. For that my iPad, to replace my Sony PRS600, is still king.
But as a toy, play a game, etc it is ok...