I was in a bike shop today, and i was about to buy a mini-magnum by bike guard, the new "improved" one with the square keys. For some reason, I happened to pick up another mini off the rack, and I was more than a slightly shocked that a key from another lock opened the one I was about to buy. I tried a third lock, same model, and the key from the second lock opened the third lock. The cut of the key's looked very similar, I'm thinking that may have had something to do with it. This is the only time this has happened when I have tried a key in another lock, or heard of it happening for that matter. It may have been a total fluke, but the fact is it happened and I saw it with my own eyes, not once but twice. I thought I should post this to spread and help share the paranoia I am now feeling about this "more secure" lock system. Toodles!