I remember when my kids were little at soccer practice, the coach had a border collie and the dog became increasingly frustrated trying to herd-up all the kids lol.. I've never owned one but definitely one of the smartest breeds, from what I've heard and read.
He has heart,ive trained many working dogs and competed many of them. Ive had a few champs in working dogs. I trained blue healers and they werent as stubborn as they were eager to please.,,But when u figure in the intelligence factor of the breeds the border collie is up there providing u figure out what he wants as praise. I liken training a border collie to training a coonhound(black n tan) BUT,if u find what trips a border collie trigger he will learn in 1 lesson. He learned to open and close the door on his crate in 2 days at 12 weeks. Day 1 was a settling in day,we let him become acquainted.
In 50 yrs of training dogs Ive seen alot of quirks...german sheperds very little,just want to please. Border collies have some quirks.....the key is using those quirks to benefit his training.