I bought the Source Rockers....similar to the CATs...I think I paid 300 for them. I was ready to install them and one too many people had issues on here and many were giving me warnings on the installation of them. I decided to sell them to the tune of 150 bucks and invest in Harlands. Guys over at Competition Wedge hooked me up with a good price, specifically set up for my Edelbrocks. Didn't have to do anything, they were ready to install with rockers and shafts right out of the shrink wrap. Took me an afternoon, got them adjusted...Selling point for me (I think it was Mr. Peabody but I could be mistaken) has had his one Harland set one all of his motors since 1992. Mine have been on since 2011 and I have not had one issue with them. I think I have a collapsed lifter on my #7 but thats a CompCams issue not a Harland.