I used medicated starter for years until McMurray Hatchery began offering Cocci vaccinations. I pay a few cents per bird to have them vaccinated, start them on non-medicated feed, and have better luck than ever before. Much less pasty-butt to contend with now that I get them vaccinated. The local feed mill is big on medicated starter, so I actually buy their non-medicated grower ration. A little "Quick Chick" in the drinking water does a good job of supplementing their nutritional needs.
By the way -- DO NOT feed medicated starter to vaccinated chicks because it will counteract the vaccination and you will be worse off than if you did neither.
Yardegg