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The hardware is essentially the same, as far as I know. There may be a couple of minor differences in the following areas, but not having the ability to compare directly, consider this rumour-level in reliability:
- my lBook as a measly 10 MB of user-accessible internal flash memory, while it looks like other versions of the device may have 64 MB, and there were rumours of a 512 MB version from lBook. They all take SD cards up to 2 GB, though, so this isn't much of an issue.
- AFAIK, the DRM of the WOL-books relies on a smart card containing the identity key. According to the About screen, my unit doesn't have such a smart card installed. I haven't actually looked at the compartment in the device, though.
- there are rumours that at least some of the lBooks have come with a poor quality, cheaper replacement battery instead of the original part.
The firmwares are interchangeable (i.e. you can switch between them without problem) and are very similar/nearly identical, although there are slight differences. The biggest user-visible change I know of is that the Jinke firmware uses their own application to read .txt files, while the lBook firmware uses CoolReader (the application used for .fb2 files). The difference is that the latter can deal with Project Gutenberg files without problems, while the former only gives good results when you reformat the .txt file beforehand.
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