The fact that this feeder dispenses food on schedule in approximately the portion set is the good.  The fact that the timer loses about a minute per week on its clock is a digital flaw even when using the power adapter.  The fact that not every dispensing is the same amount of food is also an inconsistency.  Because our animals eat the portion so quickly we only see the portion size for the first second of watching.  Then when they seem to still be hungry after eating we have to shake the feeder to get a few nuggets out and help it dispense a full portion the next time.
Possible improvements : create a display that shows both the current time and the next scheduled feeding time.  Only showing the next feeding time on the display does not make it obvious that the internal clock is getting progressively less accurate.