The only problem is a purely cosmetic, and trivially solved, problem with the display of the battery meter - it doesn't reset to "full" following a charge (all you have to do to fix it is momentarily re-connect the wall charger with the Reader turned on). The upgrade offers a number of enhancements, such as longer battery life when playing MP3 files. I see no particular reason not to upgrade - certainly the battery meter thing is a complete "non issue"!
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