EDIT: Velocity, do the Goyens perform better than the ASCOs? Also what makes yours high end? Being able to stand higher pressures or do they have better flow or opening time?
Whether the Goyen valves perform better or not, I really don't know. What I do know, is that the Goyen valves are generally much more difficult to find. I like the look of the Goyens a lot too. But I will tell you this: the Goyen valves that I buy work very well, nearly as well as my 1.5" porting piston valve (old one that blew up).
They are high end because I called them that to justify my buying four of them with no project in mind