I really love Border Collie's, I study dogs for a living, I know that these breeds were specifically bred for superior intelligence and obedience.
I like them but have never had much interaction with them. I've seen them doing tasks on tv, also. They do seem very smart
indeed they are very smart, Border Collies are usually employed in the work of herding livestock throughout the world, Truly making them a farmers best friend. 
What else do you know about them? I enjoy watching them do the obstacle courses. 
Well I know that they actually have a double coat that varies greatly from smooth to rough and its fur is usually curled.
I didn't know that, it's interesting. Is there a reason for their fur being like that?
Its just the way its fur grows, We believe its to help keep it warmer in colder climates but that has been highly debated. 
It would seem to make sense because of some of the places they herd. Is there temperament rather friendly? 
Well since they are most often cited as one of the most intelligent of all domestic dogs, Id say yes. If they are raised right.