Honestly, having used the original Playbook, the operating systems is very fluid and fantastic to use. The gestures (hence why the bezel is so big on the playbook) add a lot of functionality, and I found myself missing these gestures on the likes of the iPhone and Android devices. The sideloaded Android apps didn' run very well though.
The big reason to buy this tablet would primarily to adopt Blackberry 10, since RIM has announced that the Playbooks will receive Blackberry 10. BB10, from the looks of it, uses the same OS (QNX), so this has me somewhat interested. Also, if you are a blackberry user, the ability to tether and use the data connection on the tablet is a nice plus.
However, as of right now, the Nexus 7 would be a much better buy. I still have hope for Blackberry though, as I do miss the days when having a Blackberry had a cool factor to it. I do miss the keyboard from time to time too (iPhone user as the moment).