Zen Viewer vs GoodReader: Photo View/sort

I recently stumbled onto GoodReaders Photo section...loading and viewing/organizing them. It works generally well, but the same interface GoodReader uses for everything, so no contact sheet mode, which would be good for photos.

I've seen Zen Viewer mentioned here (and I know it's developers are around). How is it's Photo mode? All I've seen is a screenshot showing "We do photos", but does anyone have experience of how well it works?

(Generally, I'd like to have a contact sheet, that I can zoom into the pic or out and delete what I want, and move on. IF it also lets me sort the pics into folders or mark them/add notes in the tags, all the better, but those are secondary wishes.)