All my snakes go nuts for fresh garden worms. Store worms are pale substitutes. All, including the Butlers relish rodents, whole or chopped, but they seem to me to be more prone to overeating and becoming fat. (Very rich food compared to fish amphibians worms and leeches, I suspect.)
Both my eastern and marcianus became overweight last fall on a predominantly rodent diet with occasional breaks of silversides and worms.

For those who do offer rodent as part of a mixed diet, how often or in what percentage do you offer rodents?
I am moving towards less than 50%, but I am not sure how far below I should go.