Several months ago, I bought a Viewsonic G-Tablet. Cheap price: $350. Has Flash, and a very smooth email program. I can surf the web, read emails, and read comic and regular books.
I can watch movies on it, too, of course, but any headphones I use with it seem too quiet. The built-in stereo speakers are fine, of course, but when I'm home, I'd just as soon watch any movies on the TV, so the issue is moot. (I can hook my laptop up to my TV all the time in seconds, anyway, or just watch cable.)
Overall, the experience has earned the device a solid B grade, IMHO.
Very rarely, it will freeze up, especially when a browsing session includes any really heavy duty flash video usage, (i.e., clicking on more than five or six video clips on a blog site) but generally it works very, very well. Seriously, most of the time, the flash works great.
It's WIFI-only, which is fine for me. I have no intention of paying ANOTHER phone carrier charge. (SCREW THAT ).
The next tablet I get will probably be in 2012, when some quad-core models come out. Until then I'll hold off. Seems like pretty much all the Android tablets that have come out in this past year have lots of issues with flash not being that up to par on them (Hello, Motorola). I don't see why I should jump ship from my current device, and splurge on anything more expensive, if it isn't even going to be that much better, as regards flash.
It will be pretty awesome in a few more years, when tablets are as smooth as silk, performance-wise. I would never buy an Apple product, since it doesn't have flash, and I use flash sites alot.