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1. It's safe but sometimes annoying because if for some reason the formatting or text is messed up, it's considerably easier and less time-consuming to strip and fix just the broken parts of an otherwise properly-constructed wonky ePub than to strip, decompile, edit the resulting single HTML file, and recompile a Mobi.
But that's generally not a consideration for most people.
OTOH, I am also a Kindle owner who prefers to get an ePub source for my books, all else (pricing, re-downloadability from the cloud, etc.) being reasonably equal.
2. Don't ever spend money on an Apple iBook. Their is the ePub DRM flavour which currently does not have the tools to easily remove for backup. For the record, B&N's basically glorified username+password DRM scheme is more flexible than Adobe's, and does not require downloading through special software that needs to be authenticated with a central server with a limit on the number of devices you can authenticate.
4. Probably not. They are pushing their new KF8 format instead.
Hope this helps.
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