No. I haven't used them and I won't. I have however used the stock 273 rockers modified like I outlined with a .595 lift solid. They will take the abuse of a .600 plus lift roller modified like I talked about.
I don't understand why anybody would rather spend about the same amount to make a bullet proof rocker on some total chinkesium. I just makes no sense to me. One way you will have a foolproof set of rockers that will last a lifetime through as many upgrades as you want. The other way, you have some overseas rockers that may work out and may not.
I know which way I would go and it's not the ProForms. But hay, it's your project and your money, not mine. I hope they work out for you.