I have used a gravity feeder, but not the Moultrie 30 gallon. The main problem with a gravity feeder is that you can't control when or how much feed is distributed. I went thru a ton of feed with a gravity feeder. It became too costly. It became the neighborhood bird, deer, squirrel, and raccoon feeder. I have personally found it cheaper to get a regulated feeder with a solar charger. Just my 2 cents...