Just thought I'd share my experience now that I finally got the official smart flip case.
First impressions are it's a premium case, with real leather finish and doesn't bulk out the Priv too much and feels really nice to the touch.
What's really great about it is the 'smart' functionality, which basically means that when fitted and the case closed what you get is a square cut out on the front that displays the time etc. when the power switch is pressed and the case is closed. It also shows recent missed calls, emails, notifications, etc. on screen and allows you to flick up and view the details of the notifications without having to open the case, so very handy allowing you to quickly see what notification has come through. The case also has a cut out where the notification light is (top right) so that lights up still and is noticeable even with the case closed.
I paid around £25 GBP on Ebay for mine, from here: http://www.ebay.co.uk/itm/like/BRAND..._qi=RTM2108002
The case retails for £45 GBP officially, so a bit of a bargain.
I can get some pics uploaded of it in action if anyone's interested as not seen anything posted anywhere else about the case.