Here is the ACD thread: viewtopic.php?f=25&t=2782
I am very experienced with this breed, having owned and bred. Unlike BC's they want to be with thier human pack and do attach more to a specific person in the home. I have owned a BC and she was content to be outside watching the world, not like my ACD's. She joined us in the house, but did enjoy being outside where she could run and play.
My Pirate loved to ride on the Tractor, the truck and went with us when we rode the horses. When we had to move into town, he was still my constant shadow. It mattered not if I was in the house or outside, he was there. He was excellent off leash on our mountain hikes and always knew where I was.
Does your have the driving instinct?
BC's are gatherers of the herd and ACD's are the drivers