I am not affiliated with Metaltech, other than Isaac (@the great him) used to work for them and hooked me up on my uppers and lowers. I do highly recommend their upper and lower control arms for the rear.
Here is my experience. I had stock uppers and lowers, went and played a little hard and turned one of my lowers into a boomerang. I did a little research and had good luck with purchasing things from Toytec in the past so I decided to order the Rokman adjustable LCA's. Time went by, and I was happy with them. I replaced my uppers with the Metaltech ones for an FJ Cruiser because we wanted to see if they would work. They were maybe 1/16th to 1/8 of an inch longer but I needed to adjust my uppers and lowers to fix my pinion angle anyway as I was getting a vibration. This fixed my pinion angle and vibration and all was good.
Eventually I noticed that I was getting a pop/clunk noise from my suspension somewhere. It happened mostly when I was turning from a stop. I have no sway bars in the front or rear so I can be a little leany and with the S/C getting on it from a stop can flex the suspension pretty good. At first I thought I had a blown shock in the front but could not definitively conclude that as the noise sometimes seemed like it came from the rear, sometimes came from the front and was hard to pin down. I pretty much upgraded and replaced all my suspension parts in the front with the exception of LCA's. I have all poly bushings in the front, SPC uppers, new NAPA Premium Ball joints (I don't want to hear it), have upgraded the bearing in the Rack and Pinion, and new inner and outer Tie rod ends. It still made the noise so I started focusing on the rear suspension.
Eventually I concluded that since the Rokman come with rubber bushings they were flexing enough that when my suspension flexed out, especially turning from a stop the hyme joints or whatever style you want to call them were allowing it to flex enough to hit the brackets. It is the only explanation I can come up with as when I switched to the Metaltech with the poly bushings on the lower and the Johnny joint on the top the noise has never come back. I donated the Rokman to a friend because he was in desperate need and there was essentially nothing wrong with them.
I can tell you that with the Metaltech uppers and lowers it drives much better on the road. It almost feels like I have a rear sway bar in the rear again... almost. Before it was really darty when taking long turns at high speeds (60 +) and now it drives like normal, and most importantly the damn knocking/popping noise is gone.
That is my experience and my recommendation. If you would like to know my full suspension setup front and rear I will happily post it for you so you can compare. I will not say that Rokman is a bad product as it functioned perfectly well, I will say that mine were noisy and I prefer the Metaltech product.
