Share your experience!
i agree, changes are pretty ridiculous. especially the black bands...
i think, that the only way is to Flash it under Flash tool.
You can't do it by official flashing software (update service or pc companion)
Search the web please 
I really wish I could downgrade as well. After the upgrade it feels like a big phone. I hardly use it anymore.
I get it that they want to send out updates faster this way, but the stock android experience on larger tablets is just broken.