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14.2 is a publically release firmware. 15.3 is still in beta testing as far as I know and there have been some known issues with it.
I am using 15.3 and haven't had a problem, but I ONLY use FBReader. I hear there are problems with Adobeviewer (I think).
It's up to you, if you're happy with 14.2, stay with it.
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