We just got the first ones at our barn. Took about 3 minutes to get on the bale. Of course we have a tractor with a bale spear to lift the bales up but once up it is really really easy to get on. And the hay is all neat, not peed in, not pooped on and not spread all over the entire paddock.
I made one out of a 10x20 net, I believe 1 inch holes? I folded it in half, whip stiched with nylon hay string two sides, bought a "cinch strap" from Online Catalog - Cinch Chix
(which also has large hay nets) and weaved it in the open end.
Now, round bale hay nets really only work well if you have a tractor with a hay spear, that way you can put the net on it while it's on the spear and cinch it up around the spear and tighten when on the ground. Really has slowed the hay eating down (get about two more days a bale) and ALL the hay is cleared up! They used to dig tunnels down into the hay then FLIP it out with their heads onto the ground and walk on it. None of that now they eat ALL the hay
and also with their heads no longer buried inside the round bales less chance of any respitory issues.
oh and remove the string AFTER you put the net on, just snip them and pull through.
I set it though inside a round hay bale feeder, that way if any of the horses get front shoes (doubt any of them will though) they wont get hung up.
Been holding up great! If I see where they have tore it I whip stich it with nylon hay string. And it was only 50.00. Well not counting the cinch and the rope bag (for the excess when you cinch it up) I bought from Cinch Chix.