I got one of these, originally ordered the £29 one but when that was out of stock I went and bought the £69 glowlight one, damn impatience
I really like it though, still hate the page refresh of e-ink displays but for actually reading it's really nice. I'm glad I've got the glowlight as well, I don't use it all the time but probably about half the time depending on how the ambient light is where I'm sitting.
Books wise I had a few books on Kindle, and then had started using Google Play Books, getting the books from Google is simply downloading the acsm file for some Adobe tool, getting them out of Kindle was awkward as hell but there are ways around it to get them onto the Nook so I've got all the ebooks I've bought on it now.
Price wise Kindle, Google Play and Nook books are seem pretty similar in price on most counts, and with the Nook there are several other sites you can use to get books (Sainsbury's etc so you can shop around)
From what I can tell compared to the Kindle (don't own, but spoken to a few mates that have them), it's mostly comparable. There's the hard buttons for page turning which is nice, and it's also easier to turn on the backlight if you have it (I believe the Kindle is going through a couple of menu's? Whilst the nook is just long-pressing the 'n' button).
I was a bit dubious of e-readers tbh, I like real books, and I'm still not overly happy that there's no way to get the many real books I have on my Nook (legally at least...) but over the week and a bit or so I've used the Nook I've used it more than I thought I would. Almost regret not buying one much earlier but glad I didn't buy a Kindle with the way it locks you into Amazon.