Recently moved in with my parents and they have one for their chunky boi so he can lose some chub. Every few weeks we notice it’s barely dispensing any food- IF any at all. I’ll check set times and they are usually way off. (Tonight I went to check, and at 8:08, the clock said 8:42) Knowing batteries suck, I assumed we needed to change, until my mom informed me she changed batteries LAST WEEK when she adjust for DST. I try to adjust the clock but am stuck in a loop on the meal sets, and have to TURN OFF the feeder, JUST to set the clock. 
Absolutely a waste of time, effort, batteries, and sanity (from dealing with a fat, “starving” cat. 

DO. NOT. WASTE. YOUR. MONEY.