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I purchased one lock (at full retail price) for a Christmas gift. I could have gone for the "40% discount" offer for purchasing multiple locks, but those were only available in early January. I decided to find out if I liked it before I bought more. Turns out my lock cable was severed by TSA (leaving me a message that they could not open it). So much for me buying more. The concept is interesting, but I had multiple connection issues over New Year's week while traveling with it. I believe getting through TSA depends on the agent tasked with opening it and his/her willingness to work with the lock - any complications and it's a goner.