Very easy to set the combination and works great on Duffel style luggage that have lots of zippers that can be locked together like the luggage from High Sierra.  I don't have any trouble reading the numbers and I can't read close or small numbers. I set the combinations on 7 locks in about 20 minutes.  It probably isn't the best product for protection from experienced thieves, careless or dishonest TSA inspectors or baggage handlers but they definitely do what they are advertised to do "on luggage".