my only complaints are with the cheap moultrie 5 gal. model. i bought 2 of these and one of them didnt work from the start and had it repaired and was told the wires were soldered backwards. another problem i had is those alligator clips that connect to the 6 volt battery come off after a while due to the extreme vibration. just bought the latest version that is only 25$ from bass pro red head. it is gravity feed with a 5 gal bucket. it has a plastic varmint guard with a heavy billiard type ball in it that will only release corn if the deer licks it or it pushes the ball with its nose. looks like a cool idea and no battery needed!