Works great with one caveat, it will only show you answered questions for a product from your country. On amazon.ca, it will only show canadian answers, and none from the same product on amazon.com. If you search a term in the "Looking for product info?" toolbar that is on the page normally, it will also show answers from other countries.

If this tool could show answers from all countries it would be even better!

Works great with Amazon UK, after they decided to hide the ability to browse product Q&As

They fixed it so it works now, thanks.

Update: You need to pay for it after a short test.
Update: It's free now