I love asf's! They don't smell like mice, they have larger litters, they do good in large groups, and my cornsnakes and ball pythons love them.
Adult size is about 2x the adult mouse. Pinkies are close to the same at birth. ASF pinks have fuzz right away.
Litter sizes vary I usually get 10+ per litter.
Some people recommend feeding them just dog food, but that is too much protein for them, if their coats look greasy add some grain. I feed mine a mixture of wild bird seeds, oats and dog/cat food. Plus kitchen scraps, they love veggies and end pieces of bread.