We used the locks and TSA removed them. I am not happy about it and have had to fill out all sorts of forms to get an answer as to why they did it. We paid $10 for each one, (had to order off the internet because we did not have any here in western Kansas). We got to MCO and all our locks were gone. They did not follow proceedure and leave us the notice of inspection form in our bags. We can not tell if anything was stolen, but not happy about it.
The locks are a good idea, if TSA does what they are suppose to do. I have read on many different message boards that they are disappearing. So, get the locks, but DO NOT put any valuables in your luggage. It is still not a safeguard.