The 350 is arguably the sturdiest e-Ink reader ever made. The combination of small size and metal construction make it almost immune to torquing, which is likely the cause of most screen failures. The 350 fits in many of my shirts' front pockets. Those unique qualities of rugged portability are not matched by the 650 (which I've never been tempted to buy) or any other reader. I have a PW2 and appreciate its qualities too, but will not part with my take-anywhere 350s (and they just won't break!).
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