I'm still getting a Kindle for my dad because expecting him to learn anything about the Google eBook store is probably too much. He already uses (and loves) Amazon, so I think that that user interface would be the easiest for him to pick up (in terms of buying a book on the website and having it sent to your Kindle).
Plus, I'm one for brand loyalty, I guess - I have a Kindle and love love love love love it.
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