bitek, I would suggest you compare your PlayBook and BlackBerry smart phone to current Android products. As blackmannx said, the Tab Plus is older. You may as well go compare it to the PlayBook pre 2.0. Then watch as this forum trashes the tablet for a lack of native email, contacts, and calendar.
I've owned the PlayBook since its release. (I'm one of the suckers who bought a 16GB for $500.) Much of what you say I agree with, such as muti-tasking, but other points I disagree with. This includes some of your responses.
The browser for many is still crashing. It did it to me the other day, as well as a friend who also owns one. Both of us were on 2.0. (Please don't count 2.1 beta in this debate.)
Stating the quality of apps as not being good... How far opposite from my experience could you be? Evernote for Android blows the PlayBook (and most certainly the BB6/BB7 version) out of the water. Facebook is better. Twitter actually exists! (Which beats out Blaq.) Even the simple email client is better in my opinion!
The multi-tasking however, I am still on your side. It is one of the few things I do miss. blackmannx is trying to say that 4.0+ has it covered, and yes, it's easy to switch back and forth between apps. But, it's not like the PlayBook when you have music playing in the YouTube app, and when you go to the browser, the music keeps going. That doesn't happen on Android. With the exception of music, once you leave an app, it pauses and doesn't keep going. (Samsung has an exception I've found on their new Note 10.1, but it's only between select apps.)
Coincidently to coming across this thread, I just wrote up a blog article about my own experience of moving to Android from BlackBerry. Feel free to give it a read. 'Peg City Nerd: From BlackBerry to Android. My thoughts after 60 days.
Playbook browser is not crashing for me since 2.0. 2.1 is not in beta anymore. I've seen both Facebook app on Android and Playbook and Playbook is better imo as Android version is for phones not tablets. Many apps can be sideloaded on Playbook. True multitasking is great. I love it. There are things that i like on Android but i still think it is awkward OS.