Never had one, but I remember the first time I saw one. A brace of them, in fact. They belonged to Brian Kilcomins, the famous dog trainer. He was training my puppy German Shepherd back in 1980. One day he showed up to the house with a pickup truck, and in the bed were two magnificent Rottweilers. I had never heard of the breed before. After the training session, he gave them the release command and they jumped off the truck and sat down next to him. He then demonstrated their protection training for us. I found the breed very impressive, and thought I'd like one. He told me that they were a very rare breed in the US, and went for several thousand dollars. That was when they first made their appearance in the US.