I bought two initially, and one was destroyed just two days after the warranty ran out (I think it is 90 days). I wouldn't say that horse is particularly tough on things, but he's big and I'm pretty sure he thought it was the best butt scratcher ever, hence the feeder got smushed. The holes are big, so it works best if you have hay that is long stemmed, coarser, and packed together somewhat.
I use small mesh hay nets and they are a lot easier, durable, cheap, and slow them down more. If I really want to impede the hay flow, so to speak, I double bag.