Took Belle (Australian Shepard) a few days to get used to it.  Now she goes right in, thank goodness for the slow feed feature.  Keeps her from eating too fast.  In the past, we often over or under fed Belle not knowing who fed her last or how much.  now its automatic and all we have to do is check the hopper every few days to see that there is food in it.  Parley (Bengal cat) is still cautious of it, but I'm sure if it was his food in the feeder he would be checking it and eating.