When he says, the Microsoft name means something, he is right. To me it means: Stay away from it as far as you can.
As far as tablet computers go: We tried to use them at one of my previous employers as a product for our clients. We had iPaqs (Compaq/HP) running WinCE, then renamed to PocketPC, then renamed to Windoze Mobile - never caught on, too flaky, much too heavy on battery.
Next, we introduced Tablet PCs from Toshiba and several others in a 10'' screen format with stylus and keyboard (remeber those fancy laptops where the screen could turn around 180° and you could have that flat laptop with the screen facing outward?). Never caught on either.
Years passed and the only PDA that ever worked was the Newton. Then, the iPad arrived and suddenly, everybody and his brother scrambles to make a copy. So far, nobody got one that works and I doubt, they'll get it right. Android OS? Nah, that's just Linux on with a pretty face and the face isn't pretty enough to hide all the issues (battery life, speed, applications, crashes, just to name a few that I see daily from my co-workers with their Droids and HTCs and Samsungs and such).
And now, Windows Phone 7 .... aw{ful|some} - to be determined, but from what I've seen so far, I'm not impressed, I'll stick to my iPhone 4.
Afterthought: Will I be able to synch data with my Mac or via MobileMe with that phone from Micro$oft or am I left in the dark and have to find some expensive non-functioning 3rd party solution once again? At least, with Android, I can synch via Google...