My spinnerblast was a die hard mouser and I tried everything trying to get him switched over and even picked up some ASFs because they are supposedly like crack to BPs and he wouldnt give any of the rats a second sniff. The worst part was if I offered him a rat he would lose interest in feeding entirely and I would have to wait a few days before I could offer a mouse.... Then last monday I tossed in a rat pup after skipping a week of feeding because I just didnt make it to the store to get him a mouse and he sniffed it for a bit and then snatched it up and swallowed him down. I gave him a second one and he ate it. I usually have to double up on adult mice as he is almost 900g so it was getting spendy to keep feeding him mice every week. My other guy switched over with very little effort and is now a piggy! So I guess it varies but for the most part I have heard that it can be very difficult as I have experienced with my spinnerblast. I guess you just gotta try a bunch of different tricks and and be diligent and patient. Good luck!