I'll say it straight: I regret buying the Cintiq Companion (the full version, not the Hybrid one)
What is there to say? The battery life on or off is a morbid joke. The screen is, finally, too small. Dire lack of physical shortcut buttons. Overall it's just not quite right.
For that price I would've bought a regular Cintiq instead.
Until they fix the portability (no pencil attachment or keyboard integration, too few yet clumsy shortcut buttons) and impracticality of their current excuse for a battery, they don't have a winner.
Anything under 17 inches makes it not quite easy to work on either but that's not something I can blame them for.
Wish there was a carrying-flip-over-cover-stand-case thing on the market for it. I would at least be able to carry this without having a separate pencil case and keyboard (and you NEED the power cord, which is thick and has a power box. It's a laptop afterall).
Maybe I'm also too used to using two screens : one for reference and files, the other just for art-making. But...Just saying it's a regret as I look at my aging 7 years old Cintiq and knowing the Companion is my only replacement. It's not cheap.