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I used to use those; they worked fine and were perfectly secure but I found they do slightly change the feel of how the guitar hangs as it's a relatively loose metal on metal connection, so the guitar kind of swings on the axel (which you can also hear if you're playing not plugged in).
I prefer normal strap pins with those cheap rubber washer type strap locks on top, but I don't remove the strap when playing sat down.
Edit - though on second look they seem to be new "silent" ones, so maybe they're better. My old ones rattled quite a lot.
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I used to use them as well - they might even still be on the bass. They definitely work, however I found that the shape of them meant that you had to use a strap with the locks on it - a 'normal' strap wouldn't be very secure at all on the buttons. Only an issue if you're actually going to want to use another strap, and it really wasn't a problem for me, just something I noticed.
Does anybody use quick release strap locks? Like these Schaller Guitar S-Lock, I'm doing a lot more sofa playing and the strap I've got is a pain to get on and off, but if I leave it on, it's really stiff and uncomfortable. Any recommendations for quick release, or just get a new easier strap to remove?