I wouldn't switch either, I say that because I did try to switch mine off it just because I wanted a food that had less protein in it, even thou Mazuri is still a good feed.
But when I attempted the switch over, and i did do it slowly, some of my chins got loss stools, so I decided to just stay on Mazuri because I don't have that problem with that food. Some people do, but some people don't. So I agree, if your chins are doing fine on it, then stick with it.
Good luck with whatever you decide.
Jean