That being said, I am surprised that I haven't seen any experiences like my own.
I purchased a CB 6000 at a local shop without knowing much about cages, I had read several positive reviews regarding this device and figured why not!?
This was my first ever chastity device.. and wow, what a mistake.

Ill save you the gory details, but long story short, this cage has a "weld line" (for lack of a better term, right down the center of the tube.. I wore it on and off for a month or so without any complaints. On one fateful day however, I got an erection that actually split the plastic along the length go the tube where the two halves were joined (on the aforementioned "weld line"). The tube momentarily separated, and just as quickly clamped down on the skin on the underside of my penis, which made it damn near impossible to remove. It was excruciating, after trying to remove it gently with no luck, I opted to quickly pull mt skin out of the hairline crack in the plastic. I now realize how lucky I am that I avoided a trip to the hospital, another couple of millimeters in the oval shaped laceration toward the top would have resulted in a large section of skin being permanently removed from my member.
Again, this is just my experience, but I would caution anyone against taking the risk with any cb6000 type product.