They are very smart and biddable, which can be as much a blessing as it is a curse.
They don't need any more exercise than your typical fit breed of dog, and in fact can be detrimental if you go in thinking they need obscene amounts of exercise. What they do need, is mental engagement, though again within reason.
They do indeed have an "off switch", though it may have to be taught.
They are good dogs, but it's imperative you do your research, and acquire them from reputable breeders (bred for working).
Here's my guy