Hm... I mostly use the kindle when traveling. In terms of reading app, I just need to switch from one page to the next without too much delay. Oh, and the Kindle's dictionary works pretty well for me... Not sure what else I could need (or want) in the reader app itself.
The Vision HD is a bit more expensive most of the time, but sometimes the price may drop to about EUR 125. The water-proofing might be worth the few euros more to me.
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