As I've written before: These last weeks I've been creating (and proofreading) mobipocket editions of early Wodehouse works from Project Gutenberg text. In some cases I've found obvious OCR errors, missing dashes, etc. When I've tried to compare with other published editions, I've found, in general, that the newest editions (which can be seen in Amazon or Google Books) tend to have the exact same problems, often together with poor formatting.
I cannot comment on the quality of commercial ebooks, though.
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