Bests & Worsts Reviews from Amazon

I've had this gizmo for about three weeks now. My trainer sold me on it and though I haven't had a chance to fully utilize it, based on my initial experiences with it, I strongly believe it will work very well for the training I'm attempting. That being said, I am disappointed at what I discovered to be a very simple but important engineering flaw. I noticed that at random times, the machine would grind to a stop during maintained dispensing (sit-n-stay mode as they call it). I tried the different size dispensers provided - no luck. My kibble is hard and oval in shape, fits well within the hole size of the dispenser, so it was ideal for the machine but was still jamming it. After further inspection, the holes in their dispenser rings had a ridge around the opening which was sometimes trapping my kibble against the edge of the main unit as the dispenser ring spun around. The kibble, pinned against the main unit, caused the dispenser to jam and fail. To fix this, I took a dremel tool and carved out the side of the edge which was trapping the kibble and now it works like a dream. No issues. I still can't figure out: 1. why they built the ridge out in the area i had to remove 2. why they never caught this issue during the product testing I recommend purchasing this unit, but if your kibble jams the unit, don't switch your dog food to meet the machine's poor engineering - find a friend w/ a dremel or other tool and cut away the outside part of the ridges on the dispenser rings. If for some reason you foul it up completely, you can always buy a spare dispenser ring.