I'd recomend the American Hunter models. I have one and feel it is really good. I get extra long battery life also. My 6volt Enerizer has lasted 2+ years until I upgraded to a rechargable with solar panel. I installed a remote to activate the feeder when I want to give the deer a little extra. This add on required a solar recharger to keep the battery charged.
Mine is in my backyard. I've had deer, crows, raccoons, mallard ducks, dovesand bear visit it over the years.
It is true, those raccoons will clean out a gravity feeder quickly.