> i've never had a first time swipe to unlock work
I thought that - but in fact, you probably have.
It's *incredibly* slow to react; I found myself swiping a second time, thinking the first had failed, but if you actually wait that long, it does unlock.
> lots of other niggles
Worst for me is the quality of the PDF reader - it's bollocks. Poor rendering of anything but simple text, and no zooming.
Aside from that, I reall ylike my unit. It was cheap,. and it lets me read ebooks easily. I plan on rooting it to try to get a better PDF reader, though.
 One of my main reasons for getting one was to put airfield diagrams on, so I can find my way around an unfamiliar field without having the book falling open at all the wrong pages all the time. The Nook could be an ideal piece of kit for this - small & light, long-lasting battery, daylight-readable screen, backlight for night flying, and the ability to set out your detinanation/checklist/whathaveyou as the screensaver, so even if the power does fail, you still get to see what you need. But the PDF reader is so totally crap I haven't yet.