I have had some problems with 708, but not to that extent:
* Somehow my internal memory got corrupted (and, yes, I always so a "safely remove" from Windows) resulting in an endless loop on bootup. I reflashed with 538 and then upgraded again -- that problem hasn't happened again.
* I have had a few times in the past week when the unit booted up fine, I was able to select a book, but then could not do anything -- the unit would not respond to any input and needed to be reset.
I didn't see either of these problems with 538. (On the other hand, I did occasionally get a hang on dictionary lookup with 538, and that appears fixed.)
The battery life is lower than with 538, but it is (on my Gen3) a significant improvement over 685.
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