Not hugely impressed with this, though the idea is sound in principle, in reality the food doesn't fall through, I have to check every day and scoop the food forward. I think the problem is either the slope or the bowl itself is just not big enough. Either way my two cats have never used the water bowl. Just too small I think overall.
I like this feeder - I have four indoor cats and the roomy food compartment means that they never go hungry. My gripe is with the water dish - why did it not come with a bottle? I have tried numerous different plastic bottles and still have not found one that will fit. I have to refill the water several times per day.