Australian Cattle Dogs ... what's your experience?

Hi all, I'm looking for other people's personal experiences with Australian Cattle Dogs. I'm seeing a lot of generalized information that is all the same, but I'm looking for real stories.

Have you owned one? Do you own one? What was your dog's personality? Did you have any issues you had to work through? Were they easy to train? How did you train? What did you do for exercise? Mental stimulation? Did you crate while unsupervised or gate off?

Thanks!