If you look on their Q&A section, it also addresses that. It basically says they work the same with a standard volume or high volume/high pressure.
Course, I know all that's their marketing spill, but I've heard nothing but good things about them. I am also considering them for my new engine in Vixen, since they can also be used on solid lifter camshafts. The camshaft for that engine is even bigger than the
[email protected] I have in the current engine.