Helpful Rated 3 out of 5 stars
I think you have to have realistic expectations for this addon. it isn't going to work on every website and it won't always get the product right. However since I do most of my online shopping on websites that DO work (amazon, newegg, tigerdirect, etc) I get a nice quick comparison that usually works across 150 of the more popular online retailers.
I have saved money more than once using this. In some cases I have saved a LOT of money.