As a test, I did not read the instructions to see how intuitive it would be to figure out how to use.  It didn't take long to figure out the simple clock setup and then the feeding schedule.  So very easy to use.  Also very quiet which is a plus.  Even it the cat/dog was at the bowl when it switched on, I don't think they'd be the least bit startled.  
Now for the Cons.  Don't really care for the fact that it runs on 'D' sized batteries.  Had to make a special trip to the store just to get some as that is not a typical size we keep on hand.  Speaking to that, another con is I would have liked to see a corded option so that it could be plugged into the wall instead of just relying on batteries.
All in all though, a pretty nice little feeder.  Holds enough food to feed my two cats.