i haven't gotten to cintiq yet so i can't say from personal experience. i know it's as professional as it gets though.
i am currently using an intous5 (non-screen), and i have had no problems whatsoever
Actually, I haven't heard much of any negative feedback for any of the Cintiq devices. Many companies provide them for their employees (when your work is emphasized in art that is). Al I know from personal experience, is that screen tablets are the best. I draw using my iPad, so I have a screen to directly to draw on. The Cintiq would be an upgrade because programs on the computer are far more powerful and stable than iPad apps, and the screen would allow me to rest my hand on it, since it isn't a touch screen. Not only that, it's far more precise.