Mine have been trouble-free, and I've used them for a number of years. They don't come off by themselves, and if I grab both rings, I can still hold a dog that wants to dash off (useful when corralling fosters who aren't yet responsive to voice commands!)No collars in the crate and I forgot about the chinook collar. I had an original but it kept falling off without any real tension. Do they stay on better? If his collar comes off he chews it up and I would have that to worry about.
I also found the company's service to be fabulous. When my crew were young and full of mischief, they would sometimes pull them off each other deliberately to use them as tug toys (and then occasionally chew on them). I called the company to reorder and explained what happened, and they sympathized and sold me replacements at a very steep discount -- even though it wasn't their fault. I thought the company was fabulous about it. (And the dogs grew out of that nonsense!)