I mostly feed f/t. Although I do have a few snakes that will not take f/t some will only take live. And I have a few that if you feed them f/t and dont like pull on there leg to make it think there alive they will stop constricting it and just leave it and not eat it.
Although we are in the process of setting up a rodent building. Once we are in full production I will probably feet alot of prekilled that way I can save some freezer space. We have a 9.0 cubic feet deep freezer thats just for our animals and it would be nice to be able to put some ice cream or something in that thing lol