Kali's Teeth Bracelet

We were just curious and looked up The Contender to get a feel for it, since we are using our cage more often now and want something with better quality. My wife noticed the Kali’s Teeth Bracelet. Has anyone here used one? What was your experience? We already have a ‘Ring of Tears’ (see photo) that we use in punishments and games. tears4.jpg It sits around the base of my penis, stopping me from getting much of an erection by digging into the shaft. It does its job well enough. The points aren’t too sharp. In fact, they feel quite sensual until I get really hard, at which point they dig in a bit more than comfortable. I’ve actually had to stop a blow job because the pain made it impossible to cum. It’s a wonderfully frustrating piece of equipment. However, for longer term wear my wife thinks the Kali’s Teeth Bracelet would be entertaining (for her). I worry it might be a bit too painful though. Opinions very welcome.