I have to give it an average rating. It looks very promising, but when trying out the demo, I registered, created a registry, and then logged out. I then tried to search for the registry - didn't work. It asks for the e-mail of the registry owner, I tried 5 times and got, "No registries found" all 5 times.
It's got potential and is a much needed feature for Virtuemart. I would like to make a couple of suggestions:
1. After adding something to the registry, it takes you to your registry, but from there, it's awkward getting back to the shop. There should be a "Continue Browsing" button/link/whatever there for easy navigation.
2. I hope the layout/look of the mod is just because of using the default template. If not, needs to be improved to look "pretty".
3. An AJAX "Add to Registry" effect would be nice. On one of my sites, there's twenty different combinations of colors/sizes etc.. on one page. A customer will never take all that time to add exactly what they want, so it wouldn't be beneficial to me anyway.
Just some feedback, but like I said, it looks very promising. Keep up the good work.