I rarely used mine; when I finally did use it last year I arrived back in Nice and couldn't get suitcase open and had to cut the ends of the zipper pulls.

I noticed on the train today that the Tumi next to my suitcase had a TSA symbol next to the integrated lock, and a number which I assume was the key number to use. (I'm in France; TSA locks are extremely expensive in Europe, so I took note of the Tumi having an integrated lock)

But I suspect that TSA will cut those locks just as frequently as they do 'regular' locks, which means snipping the ends like I did on my suitcase.

Also, if it is an expandable suitcase those locks may not work if you use the expansion feature.