Oh yes they live to challenge you! Kain is very well behaved since I got him as an 8 week old pup and worked with him from day 1. The only thing he has trouble with is "stay".. Only because he simply is too hyper to stay anywhere unless there's a treat involved lol!
He's a pretty good disc dog. He can catch them on the fly if they are thrown right. I ended up ordering him an actual disc-dog frisbee online a couple years ago since the cheap ones from the stores are too hard and have too much of a lip which don't fly right, and they can damage the mouth. He will play fetch with absolutely anything that can be thrown until he's so wore out he can't run anymore, and he loves tug-of-war with his ropes and rings!
They are awesome dogs!
The only things people need to be aware of before getting one is their incredibly high energy, high intelligence, and their nipping behavior. They were bred to nip. They nip while playing and must be taught that it's not appropriate to nip people or children. They will also chase and try to herd anything! Including children, other animals, and cars.