Well the weight and PDF reasons are pretty valid. But as for Internet, I don't think it's really suitable for that at all and isn't designed to do it as well as my laptop or iphone. I just treat it as an ebook reader.
Folders would also be handy, but I just keep < 50 books on it and it's fine. You might be better off with the Sony (does that have folders?). Maybe return it and wait for the next iteration, may be lighter and have better PDF/Internet
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