Not personally (animally?), but I was thinking of buying one and hung around their blogs and associated message boards for a while. I still keep an eye on them, one eye only, but they're not really for me. There's general consensus that the PixelQi version looks best in sunlight, not quite so nice (although useable) in normal interior light. The normal (un-adam) PixelQi screens are supposed to be extremely easy on the eyes in interior light if you turn the backlight on just a little bit, but the Adam has a capactiive layer on top of the screen, which is very glossy; most people find the high gloss annoying, so there's yet another layer on top of that which oiriginally was supposed to be applied by the end user, but too many people complained about having trouble with that (dust, bubbles), so now they put it on at the factory, and you can removoe it if you want. The upshot of all of this is that the PixelQi version isn't quite so nice to read at normal room lighting levels. (There's an LCD version, also.)

But all this is hearsay.

The other bad thing for me about the Adam is the capactitive screen, so you can't annotate PDFs with anything smaller than the end of your nose (and there's no built-in software for that, which is not such a big issue; but the software that is built-in is a bit of a mess, although that's slowly being fixed).