I've recently purchased the NC - and in the process, read a bunch of reviews. I thought I'd list the link to reviews for others doing research on the device. My filter was to only place reviews where the author apeared to have had at minimum a few days testing before publishing - I ignored rethose where the author only had a few hours hands on.
There are probably tons of other I missed - feel free to add others are you find them.
(discussion by PCMag editor)
(video review which shows how it works, click on close caption to read what he says)
(a pretty extensive review, comparing to Kindle)
this reviewer talks about the NC after having used it a few weeks. Definitely worth the read.