works for me
Can be charged from a standard USB port, yes. Battery genuinely lasts for weeks. £40 extra buys the cover with LED light, well worth it IMHO. The two combined work very well.
Have only seen one naked Kindle, on the tube, all the rest seem to be with the burgundy cover, although not many with the LED light. Go figure.
Horses for courses, I'd say. Would like an iPad equivalent, but saving up for an Android first.