they work, but not too well
I got these locks, and their price is the same as the quality; low. They stay locked when locked, but we got a PacSafe lock with a set of two keys - and one key clearly didn't match the lock. It also didn't fully open so required some manhandling. At least it is openable by TSA officials - so they don't have to cut open your bags to see whats inside in the airports.