We're very pleased with this hay rack.
1- My explorer guinea pig CANNOT climb into it like she can with wire racks and racks made from a crate grid. She has hurt herself doing that in the past, and has also almost fallen out of the cage doing that in the past. So this is a real safety item for us.
2- Like any rack, it keeps the hay off the cage floor, so hay stays unsoiled.
3- This rack is less likely to shed tons of hay, so we have less waste.
4- Pigs can get up on two legs and pull hay from the top if they wish. But my smaller pig is just as adept at pulling hay out the bottom holes.
5- My pigs haven't chewed on this rack so far.