http://www.engadget.com/2011/10/25/pentax-q-interchangeable-lens-camera-review/
"Wrap-up
Pentax really has managed to design the world's smallest interchangeable lens camera -- and yes, it does work. But there's no magic at play here. The Q is small because all of its components were downsized -- Pentax took everything from the lens to the image sensor to the mode dial and shutter release and gave them the shrink ray treatment. Everything but the full-size hot shoe, LCD and SD card slot are miniature versions of what you'll find on larger, more capable cameras. The result is an attractive, pocketable ILC that doesn't quite follow its powerful pedigree.
The Q is a very unique camera -- one of a kind, even -- but that doesn't mean it's the one for you. If money is no object and you're not keen on capturing incredible images and video footage, then perhaps you'll still consider picking up a Q. As for the rest of us -- we're perfectly happy with our larger, much more capable ILCs, and wouldn't dare consider making such a sacrifice just to carry a bit less weight on our shoulder."