Thanks
The only problem with mine is when using silicone. Since silicone is so soft the stainless teeth can't get a good grip and it can slip out pretty easy. I have a big load of "helpers" on the way. It's just a thin stainless steel sleeve that fits inside the end of the tube that goes in the fitting. This supports the tube and lets the teeth get a good bite.
I had considered a swage type connector, but these are easier to use once it's in your case. No wrenches or tools needed...