I have two of these and they are both working accurately.  I have them set for my two cats - 1/8 cup 4 times a day.  Set up is easy as long as you read the instructions word for word.   The quantity has been accurate.  I have been using trays (not the bowls given) so that the food spreads out and my aggressive cat cannot eat as fast.  My cats might be able to sneak a single pellet or two of food by reaching up into it, but overall it has kept the food bay safe from them.  I am using it on the slow mode, but can't see a difference in how it comes out.  I have ready that the slow mode doesn't work as well in the smaller quantities.  But that is why I have it set to 4 times a day.  So not a huge deal.  So far it has not gotten jammed and distributed food on time.  Finally, a automatic feeder you can trust!

I would give it 5 stars if they came out with a power adapter.  It has been working great with the batteries, but I fear that it would stop working while I am away.