I have used slow feed hay nets for years and my two teenage Morgan geldings have only gotten better at getting the hay out of the slow feed nets. I need to add that the slow feed nets from SmartPak are really nice. Up until this year my horses have got so efficient at emptying the hay nets that I have layered them together. First starting out with two now we are up to three. I have put them together on a single draw string for the ease of use, but I want to find a different style of slow feeder that brings movement in to my horses lives while eating. I saw a slow feeder called “Port-a-Grazer” does anyone out there have any experience with this slow feeder?