I tested the MRE rocker arms along with HS, RAS, T&D and some others on my 470 engine. I was using a solid roller with roughly 0.700 lift. All of the rocker arms I tested worked just fine on the dyno. They all made roughly the same amount of power for the dyno test. I ended up keeping the T&D rockers for the dyno engine and I put the RAS rockers on my street car. For a big roller cam I recommend the T&D rockers. If you can't afford the good rocker arms then either run a smaller cam or be prepared to replace busted parts down the road. If the roller cam is in the 0.600 range then the less expensive rockers should be okay for a few seasons.
https://www.hotrod.com/articles/trying-find-extra-power-rocker-arm-testing/

And if you read the article closely you'll see that I spent a ton of money on rocker arms, pushrods, dyno testing, etc. and didn't find any power. That was a lot of work for not much to show.