I will never be putting a collar on any of my cats, even a safety one!

I had a saftey one on one of mine and it got caught on a bush, when she tried to pull away, it got caught round her face and was strangling her. She was freaking out so much I couldn't get it off her until she passed out.
It only took about 30 seconds before she came back round, but god it was scary! And just think, if I hadn't have been there, I would not have been able to release it.

I also heard about another cat who was hanged by his collar from a tree the other day and unfortunatly died. Safety collars do not always release!