I've been using the eNYPL since 2005. In that time, they originally started with Mobi and PDF (mostly Mobi), but have shifted almost exclusively to ePub and PDF. So a lot of the older titles that are Mobi aren't being checked out much now that cell phone/PDA access to Mobipocket is lessening. So that probably skews their results.
Also, when I first started borrowing from eNYPL, wait lists were at most 2-3 people - I usually got a title within a month. Now, waits on popular items are 30-60 patrons, and it can take months to get a book. Luckily my local library (Buffalo) joined OverDrive two years ago, and has smaller waitlists, and purchases most of the same fiction. But I really rely on eNYPL for the nonfiction.
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