Thanks Nate, it's nice to see some acknowledgement of the fact that not everyone reads on e-ink. Not that I feel there's any deliberate marginalization going on - it's just that the majority of people here have e-ink readers, so that's what conversation centers around.
Personally, I have no plans to abandon my Zodiac because 1) It serves a multitude of purposes besides reading; 2) it's the largest device I can envision myself carrying all the time, and being able to have reading material with me constantly is, for me, the main advantage of e-books; 3) it has lovely ergonomics; 4) battery life hasn't been a problem for me, although it doesn't approach that of an e-ink device;5) the screen size seems fine to me (as wide as a paperback, but shorter vertically), as does the resolution and the backlighting; and 6) it gives me enormous flexibility with regard to reading apps, file formats, sources for books, and their appearance on the screen. If it ever wears out...well, I guess I'll have to pull out the backup Zodiac.