I'd have to agree with Sparke here. Stunning has worked best for me with my Balls. I think it depends too. If you're an owner of one or maybe two Balls, you might be fine fussing with FT. Email breeders, especially the "big ones". I'd be willing to bet that most, if not all of them feed live(I know of at least 2 off hand that do). Why? They have too many snakes to fuss with FT and I'm sure they'd waste alot of food doing it too, because Balls are so fussy about what they eat(there are always exceptions to the rule). If they refuse a live one, they just put it back in the rack, where as if they refuse a FT, you pretty much have to toss it, because they get nasty after thawing, refreezing and thawing again. In my experience, which is little also mind you, I find FT to be a pain in the you know what. I admit, they are cheaper, but I couldn't get my Balls to feed consistently on FT. Stunned or even FK sometimes, they eat like clockwork, once a week. I like my snakes well fed and not missing meals. I know some people say, well they can go months without food, but I don't have the heart to starve them, to get them on FT, when I know they'll eat Stunned or FK fine. I met a man a while back, who was insistent on feeding all his Balls, one live mouse, once a month. Crazy right? But, If you offer your Ball FT every week, but he refuses and ends up eating once a month, when you know he'd eat live or stunned every week, isn't this the same thing? I also have to wonder if letting them go without food for a while(other than in the winter when they go off feed), will stunt their growth. I would NEVER leave a live rodent in the enclosure for a long period of time, cause I've seen what they do to each other. They are nasty things and shouldn't be left unsupervised with a snake or for a long period of time. It all depends on what your snakes will eat, I think. If your Ball will pound FT every week, without hesitation, I'd say go for it. Do whatever works best with you and your snakes, but be smart about it also.
-Cathy