Had then ever since I can remember. Before I was born. My mom was a small breeder, but stopped after my sister and I were born...However the dogs were still always around, we had Black's, Blue's, Harlequin, Mantle, Fawn, Brindle's and even a Merle. sometimes 2 or 3 at a time..my mom loved them..we also had 60ac of land and plenty of room for them to run and feel free...They are great dogs will protect you with "there life"..my mom use to tell me the dogs would not let strangers near us as kids..if you got to close the dogs would sure let you know with a deep growl. If you heard the deep growl it really makes you think twice esp if you don't know the dogs disposition. They are protective, genital giants, love attention, friendly 90% (depends how raised), loyal and well obedient under the correct training.
The only negatives is they only live about 7-10 years on average..eat lots of food and cleaning up the back yard after all the number 2's...
I had one as a kid. If you're into giant dogs they are a good choice as almost all have a solid temperament with family and kids. If you're looking for a guard dog that does more than look scary they will disappoint you. The short lifespan was really what turned me off of the breed.
Sweet dogs but I find them to be more of novelty thing.