Almost all of my snakes will eat asf's and rats and only one is a solid asf eater and she is one of those picky eaters, but does real well with asf's.

I start my hatchlings on asf's also and go to rat fuzzies and then pups and on up.
Most of my larger snakes though will readily switch back and forth between asf's and regular rats,

The worst part about feeding asf's is when they aren't eaten, retrieving them to feed to a different snake can be tricky, lol.

Asf's are so prevalent here it's hard to give them away sometimes