How often do we depend on customer reviews when shopping online, considering a restaurant, or making movie plans? We don’t even think about how Yelp and Rotten Tomatoes have changed the way we plan “dinner and a movie.”

But if you’re suddenly in the market for a pacemaker, hip replacement, or other medical devices, it isn’t so easy to check the reviews. And there are millions of “bad reviews” for medical devices out there.