That is an excellent tool for IH stuff. Not as fast in a "production" environment as a "c" clamp tool, but it works great when used with a cylinder air hold if ya need to change a valve spring, unstick an "stuck (seized)" valve stem, or replace umbrella seals without removing the heads.
I carry one of the hf valve tools in my travel box and I keep one in my "dead IH recovery" tool set also!