My friend's mare wore them for six months straight and they have since been donated to our trimmer to loan out to her clients while they wait for their own boots. They're $$$ but well worth the money and are an absolute miracle for laminitic/foundered horses.
Another vote for Soft-Rides. They were a great comfort for Willie in both his severe laminitic episodes. Not inexpensive, but do hold up well, as long as you are just using them in the stall. I would not suggest using them for turn-out.