P/k is not a frozen rat as stated above. It is a freshly killed live rat. A good way to make sure there isn't any harm done to your snake (bites from a live rat), but also avoid the whole store, thaw, heat business of f/t.
As for the whole Asf thing, none of my snakes are hooked on them. As a matter of fact, most of mine won't eat them. We breed asf's and rats, so ours get offered both. Right now my boa is the one consuming the most asf's, because him and my one male bp, are the only one's who will eat them.
Also, as others have said, if you do live feeding make sure your feeders are well fed and watered. And never leave your snake alone with a live rodent. Have tongs or something handy in case your snake doesn't get a good hit. You will need something to stick in the rodents mouth to prevent it chomping your snake.
Ultimately, what you wind up feeding, will be what works for you and your snakes.
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