If you're not feeding free choice protein you're pizzin in the wind.
Depends on how you do it. You can feed free choice and stil be relieving in the wind, and not meeting your goal
Certain bucks in a bacholar group can dominate a feeder. If you don't have enough ports, or even only one feeder in a location many of those deer won't get to eat much.
You can be highly effective with a timed if you know your densities and or have enough of them. All depends on what your mission is.