No matter what type of feeder you consider; you may need to deal with critters like squirrels and coon. I have a 200lb. EZ Load feeder made for Cabela's. You set the times and duration of the feeding, and it's very acurate. After the first six months of use; i needed to put a cage around the feeder unit that spreads the corn. Racoon figured out how to climb the ladder for filling the bin, and reach over to spin the arm that discharges the corn. Squirrels are even better at hanging upside down on the unit and getting all the corn they want. There is also a plastic funnel inside the bin that feeds the arm that throws the feed. Unprotected; squirrels easily get to the lower part of the funnel, and chew it up. I've never used bunk or gravity feeders, but i'm sure you would be spending alot of money feeding critters other than deer. You wouldn't believe the number of coon in your area until you steup a feder!