I'm wearing mine right now as I write this review. They're very well made and have lasted me a couple years already. Since just about anything solid can be used as a bottle opener I don't see any point in having them in the flip flops. It was a fun novelty when I first got them, but they cause me to slip on rocks and get caught on my clipless pedals on my mountain bike. That, and mud, rocks and anything else you can step in get caught up in them, so I probably wouldn't want to use them on anything I put my mouth on. They're reaching a point now where the material between my toes is stretched out, so it's time for a new pair. The DC Cabo sandals are very similar and don't have the bottle opener, so I'll probably go with those next.