I personally don’t like the cintique series.
I’ve had to draw on a tablet for so long that I am good with it. And when you’re drawing on a tablet you get the benefit of your hand not getting in the way.
I have used both the 21" and 12" and while I like the 21 more than the 12, I still only use it at work for concept stuff, nothing that is going to take me any real time. And it would probably have been faster for me to just get a pencil, some paper, and start the scanner.
As to the 12" I hate that little thing. There is no screen real estate to it. It feels clumsy and in the way…kind of like drawing on a napkin on your leg.
Some people love their cintiques though…so eh, take it for what it is worth.