The BeBook is the same as the Hanlin v3 and Astak EZ Reader. For support purposes you might want to consider the Astak since you're in the US.
You can find lots of info in the Astak forum here on MR and it will generally apply to the BeBook as well.
As far as .lit files go the BeBook's/Astak's/Hanlin's do support them, but they tend to run a little slower than other formats and the ones I've seen have problems displaying correctly (spaces in the middle of words that aren't there on the desktop).
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