Where can I find other people's complaints about medical devices?

FDA collects reports of adverse events involving medical devices in the MAUDE database. The data consists of all voluntary reports since June, 1993, user facility reports since 1991, distributor reports since 1993, and manufacturer reports since August, 1996.
To search the MAUDE database of medical devices which may have malfunctioned or caused a death or serious injury, use the following link:
Manufacturer and User Facility Device Experience Database (MAUDE)