Permabanned
That has been my experience. Most are very well behaved, I remember one that use to go everywhere with its owner, you’d quite often see him riding his bike with the dog running beside off of its lead. But you really wouldn’t want to be on the other end of an aggressive staffie, they will and can do plenty of damage to most dogs or humans.Hah that made me think 'Staffie - dog of peace.'
One of my best friends has a Staffie, she's amazing. I also, see another Staffie on my walk who's a gorgeous well-behaved dog. Another owner I met had her dog attacked by a Staffie...
So, it really is down to the owner.