I've been testing this plugin for a few weeks now (well mostly I was waiting to see if it did get the pictures into Google's rich-snippets, which Google's bots finally did pick up today). It's great and generally works very well. BUT...
There's a bug in which sometimes all of the recipe ingredients and steps get duplicated. I *think* (90% sure) it happens when a recipe is previewed from the "add new" recipe section.
It could be a minor annoyance and a negligible bug, but it's upgraded to a major one because the way this plugin works, every time you delete a step or an ingredient the screen refreshes (instead of a little tickbox/bulk action system or something), and I ended up finding it faster and cleaner to delete and re-enter a 13 ingredient, 5 step recipe which got quadrupled than it was to fix it.
If it gets fixed, you get your 5 stars. :) I'm sending a donation regardless, please keep supporting this plugin.