Need more info on everything except Greg [I've bought all my feeders from him and price/service has always been great-he was even gracious when one check got lost in the mail {no, really, it did!}]:
1] What kind of fish are you feeding? How big are they?
2] How large is your pond?
3] How close do you live to your pond? How often will you be able to check/refill the feeder[s]?
4] What size/type of food do you plan on feeding?
5] How far do you need the feeder to throw food?