While I haven't tried the Kobo I saw one a few years ago and they felt cheap to me especially in comparison to my Kindle K2. This may have changed in the interim but I can only speak from my experience. The Nook seems like a good product but it's a availability may become an issue and what good is a warranty if the company goes under?
Ive only heard good things about the PW and if the SW is any thing like my K2 I would see no issue in recommending it. I've had one issue with my K2 it it may be nearing its end of life ( 4 years???) but am getting another one without hesitation.
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