I've said this before and I will say it again, without apology: Pits are dangerous.
I 1000% agree with Ann on this. I feel a 'nice' pit is simply one who hasn't turned aggressive... yet.
Years ago, our police officer neighbor adopted a partial pit puppy who was sitting on the Merritt Parkway abandoned and then never claimed. I watched that puppy from a young age, including caring for it when the owners were travelling. I was NOT a stranger to that dog. I always followed the same routine... open garage door, close garage door all the while talking to and announcing myself, grab a treat and the leash, open the door into the house. I go over one day after finger surgery, same exact routine, but it was weird cuz I didn't hear him as I normally did prior to opening the door. When I opened the door, holding onto the handle with one hand thank goodness, he came at me but misjudged where I was. He went for my stomach but I was too close and instead of biting into it, he hit me like a rock. With the hand on the door, I beat his shoulders and then his head into the door frame until he backed off of me and retreated. My husband was waiting out in the car, said he had such a bad feeling when he watched that garage close behind me, then I came out white as a ghost, shaking. He bruised my lower ribcage, most of my stomach and you could see where his teeth hit me. The owners were 'so surprised!', 'Archie would never hurt a flea!'. I had to leave their house the following year when we went to a house party and I realized Archie was there roaming around. I saw him one other time after, always felt like he viewed me as the snack he missed out on. I have been terrified of pits ever since. When Deacon was in puppy class, we would do this pass the pups around, there was a pit, I had a complete terror attack over this puppy, sweating, heart racing, couldn't breathe - my trainer recognized and got me out of the situation. Never trust a pit.