No worries Russ. Yes, the app recognises my printer, and the Play Store lists the app as compatible with my N7 (and phone for that matter).
TBH I don't use it *that* often from them - any printing is mainly from my laptop across the home network - but it's good to have it.
Works easiest for photos, as Epson Print is an option in the sharing/sending list for a pic. Web pages are a bit more clunky. The way I do it is to copy/paste the URL in to to the Web Page Print option in the app. There may be a better way, not sure.
Hope you get it going. Good luck.