I put them on all my P07 (.40 S&W) magazines. They "work" great. However, I don't like the way they carry. That extra added little bit of length digs at my under arm in the AM3 holster. I don't notice it in the IWB holster but I'm not really trying to conceal (yet) in that one. It's just used for carry around the yard/garage with a t-shirt sometimes covering the grip.
They fit the CZ 75 magazines, too. But, you can't use a 16 round magazine in a full sized gun as the plastic lip on the base is a little too thick to allow the magazine to lock in. The do, however, work in a compact sized pistol (gives you 18 rounds) if you don't mind the little gap between the base and the bottom of the grip.