1. What features do you want to use that you may or may not be able to use?
2. Not any more. You would need a firmware able to be jailbroken in order to jailbreak and install KOReader I believe Amazon has moved on from such a firmware so when you buy a PW5, you get a firmware you cannot jailbreak.
3. You don't have good eBooks management.
4. The ads are not too intrusive and they do not show while you are reading.
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