They are great dogs, but they can be difficult. Ours, who we lost about 5-6 years ago, was the wildest and yet the most loyal dog I've ever known. They really do have a wolf-like pack mentality (our insisted on sleeping in the room with someone from the family), but can also be extremely stubborn and destructive.
They will need LOTS of exercise, and they WILL destroy things (chew toys, furniture, etc.) if they get bored and are left unattended. They're also ridiculously strong - we had ours on an overhead run for a while, attached to a tree on one end, and a 4x4 post cemented into the ground with 200 lbs of cement and a few rocks. He pulled the post out. So we added another 200 lbs of cement and more rocks, and he still managed to lean the post at a 30 degree angle from pulling. He never learned to walk on a leash properly, so talking him for a walk was more like getting taken for a walk.
With all of those negatives out of the way, ours was a very loving dog. He always wanted to be with the family, and loved nothing more than to curl up next to someone on the floor and lay down like we were part of a pack. He loved making people laugh, and would sometimes chase is tail as fast as possible like a crazy fool, and pause occasionally to make sure you were still watching. He played soccer with a 40 lb rock (his favorite toy, despite all of the actual toys we bought him). He played with his dog bed, and sometimes slept in his toy box. He looked at you lovingly with his blue eyes every chance he got.
I would love to own another one some day. Amazing dogs, but NOT for someone that doesn't have the time or energy to dedicate to them.