live feeder here too. my only problems with it are that once the rat realizes the situation it becomes defensive & offering it more then once at that point has just led to it turning on my snake. she has yet to be bitten though cuz i'm always parked right in front of the cage with the doors somewhat open so i can get in & intervene if needed. typically my snake grabs the rat within the first minute the rat is put in but the minute she hesitates or turns away i take the rat out straight away.
the problem i'm having with refusals & live feeders is that the store owner of the place i buy my feeders from is getting to the point where he is no longer allowing me to bring in the rats my snake refuses, either for an exchange or just a return.
for those reasons i wish my girl would take f/t or even prekilled but she wont touch 'em if they're dead/dying. i swear its like she looks at me like
"hey! i did not kill that! dont expect me to eat it."
good luck though with whatever method you choose.