I think the purpose of luggage locks is to cause a problem if someone wants to open your luggage while co-workers or passengers are nearby and there is a need to be subtle and quick. This lock accomplishes the task. The lock is reasonably rugged - without the combination you would need a tool to open it, it's straightforward to change the combination from the factory preset, the cable easily fits into place and comes out, and the lock can be opened by TSA inspectors when that's required. If I had to buy another lock, I would buy this one.
Don't lose the instructions. Here's the website where you can download them in pdf format: lcibrands.com/item.php?sn=e4d8aa44376afbc3763aa54e52adccde.