We brought two of these and they were easily broken into by the cats and the kibble would always jam. 

However, after removing the trap door inside and looking at the system there is a very simply fix to improve the system. After a few minutes with a dremel we were able to have the system working 100% of the time. No jamming and it would always give a 1/4 cup of kibble (it is actually slightly less than a 1/4 cup if you talk to our cats).