Pros: Quiet, loyal dogs with a sense of humor. Great dog for a single person. They're happy to exercise but can get by without too much.
Cons: Often discriminated against for housing & insurance; they have a reputation as being aggressive. VERY stubborn - possibly just not that smart. Need lots of training. Twice a year your house will be covered in fur/undercoat.
These dogs have a completely undeserved reputation. They're sweet and eager to please; they can be dog-aggressive but this can easily be controlled/trained. (And they're often better behaved around other dogs than many "family" breeds.)
Please adopt one. Shelters are brimming with these guys and most end up being put down quickly.