BGR has a video of the BlackBerry PlayBook in action and it looks pretty smooth. The video shows off the Playbook's app multitasking, the general user interface and answers questions on how it'll work with current BlackBerrys.
I don't understand all the RIM negativity. At least where I live Blackberry is still King. Go into any business or law environment and you won't see people with I-Phones or Android phones, you see people with Blackberrys.
All the toys and bells and whistles are great for the yuppie & techie crowd, but for those who need to get things done on the go, Blackberry is where it's at.