Trying out this Wikibuy thing that supposedly gives you better prices than Amazon

I accidentally stumbled across this on one of those sponsored Facebook posts, and it looks worth giving a try. So far I've installed it and poked around a bit. I haven't found a price that's better than Amazon, but I haven't had it installed very long. So far it seems more legit and less gimmicky than things like the Swagbucks toolbar. I'll update once I've used it more. Does anyone else use it and have any reviews or tips?