Design my suspension...

Has anyone ever talked to MM about the XD lower "weight jackers" like in the pic to know if there is any known failures with them? I want them but the idea of a weight jacker lower control arm makes me wonder how they even last(but then again I've been known to worry over nothing, haha)

I have had my MM weight Jackers since 2005, & 30k+ miles & have had no issues & I drive my car hard. My buddy also runs em' on his 10 second notch with 5000+ RPM launches with no issues. MM stuff is truly the most durable suspension on the market, thus the reason it costs so much.