When I bought it, the item had two "freebie" reviews, a 4 star and a 5 star. Neither one of the reviewers even knew what the product was for, and they rated it based on the idea it was just a plain ol' padlock. It's a fucking awful padlock because it's meant for people who are attempting to learn how to pick locks. Instead of saying "Oh, I don't even know what this is, and therefore couldn't give a useful review," the reviews went: "yipee, free stuff, let me just rate it highly based on whatever use I found for it."
It's a good trainer lock, but locking anything with it seriously would be hella stupid. It's clear, so you can see all the guts and pin locations, which makes it really easy to pick.