I've used rolled leather for all my dogs and appreciate a collar that doesn't cut the fur. They're a bit hard to find and they don't come with bling, but they're also almost invisible on the dog. I like a collar that doesn't leave a deep groove on the neck, that I can leave on all the time and looks comfortable and is durable. I think one collar/dog life is better than dozens of plastic collars/year of the dog's life.

Pros: last a lifetime

Cons: no

I love this collar for my collies, it doesn't mat the long hair around the "mane". It is worth the investment and i would recommend it for any dogs that have longer hair around the neck.

Pros: perfect for the long hair of a collie

Cons: a little expensive, but worth it