I'm also looking into boots for my horses for this riding season. I've ridden with a few people that have used the Cavallo boot, only to lose them in the mud, or to have to stop and reattach them during a ride. Haven't been on a ride when they are being used without something happening. Not impressed with them at all.
My farrier have recommended the easy boot, edge or epic. I've seen these used without any problems on a variety of terrains.