I always recommend against automatic feeders.
Fish food is the main nutrient input of your system this is not something that should be left to chance.
Feeding fish is a great way to spend all of 30 seconds (very low labor cost) and get alot of information about your system. If the water temperature or chemistry is suddenly off the fish will not react normally when fed letting you know something is wrong.
Some times over automation makes problems into disasters we see this issue with overly automated indexing valves and other overly automated solutions to simple low labor problems.
For all of these reasons I always recommend against any kind of automated feeding it costs all of $0.50 cents of labor per day if that to ensure your biggest input is done right.