I bought the same feeder this year. The hay roll lasts about 50% longer, and doesn't get "abused" like it did before with no enclosure. (My horses scratching their chests on it, lying down in it, using it as a bathroom, etc.). It will almost pay for itself in one season, and also is much less work.
I have a very similar 'tombstone' style feeder, but the lower part is round pipe (set too close together for a foot to get through) instead of sheet metal. I'm hoping it'll be more durable and safer in the long run, likely since they're showing no signs of wear in their second year of horses and cows. I got them from Cashmans (http://www.cashmans.com/Cashman/CA_W...2574D70048A731 ) during their QH Congress sale.
I have a tubular one like Wildblue's, but it's "economy", ie only the top and bottom pipes around the base. I fastened plastic vinyl lattice (like the wood lattice) to the inside and it works very well to contain the loose hay.