When any of mine are in working mode, if someone gets in the way of -whatever- target, they will snap witout ever taking their eyes off the target.
Now some mals are not as high drive. You can get a washout dog that will be fairly laid back. Not GSD quiet, but lazy for a mal. Alot of the show line dogs are nothing like actual working dogs. Yet most of these lack the whole reason for a mal to exist, or at least diminished.
"A well trained dog should not bite unless told". Yes and no. They use their own judgement. However most mals are so extreme and fast to react, you must have complete control of the situation they are in. I have seen many trainers get bitten by mals. These were not even PPDs. Most GSD, rotts or dobes will only bite when told. Mals and dutchies are like dynamite.
Really great dogs. I would go to several clubs, look at many dogs, and if you decide on this breed, go with a not so high drive working line.
I have an Ot Vitosha female, she is work everyday. We ride four wheelers, horses, go on runs, fetch (every waking minute lol), and she does several long tracks every week. We work articles, ob training, she never tires. If she doesn't get several hours of physical work, then plenty of mental work (not food puzzles mind you) she will destroy something and is a real B**ch to handle. However she is one of the smartest dogs I have ever worked with.