I usually don't much care about typography and formatting, except when it's too horrible to ignore, which unfortunately happens much too often. The only book whose formatting I noticed in a good way is
Ulysses, in the Penguin Modern Classics collection (ePub). I just wish it had been proofread as lovingly as it was formatted. There are not THAT many OCR errors, but still too many for a book like this, which is already hard enough to understand.