I have seen a ton of different versions for farriers, the type I like the best are just a basic spring action, step on the lever to open the vise and the coil spring does the rest. The hardy vise/leg vice are great for quick work, I use a visegrip with a hardy stem and old rasps for a wide mouth but it takes longer because of the adjustments.
farriers and hot rasping is almost becoming a lost art... these days nine out of ten will just take there cold shoe to the grinder, more and more don't even use a forge and that makes me sad.
speaking of hydraulic.. If I offend anyone here that uses this product Im sorry but at the last shoeing convention someone was selling their new product hydraulic hoof nippers!
maybe Im just old school and like to use these muscle things I was born with but I just dont understand these products. Sure it works, it could probably cut your car door open like the jaws of life! but I could nip a horse in the time they take to do one foot!