I'd use the hell out of this utility, since I read wicked amounts of fanfic.

I think I could be getting some of this data if I was religious about using Calibre to track all my fics, but I'm not that detailed-oriented.

So:
- word count, not pages
- for me, kudos=finished; comment if I can; I bookmark the fics that 'count' for me.
- rereads for fic are the same as rereads for any other medium, I think. Since AO3 provides me tags as a bookmarker, I'm willing to track that info there instead of this putative utility.