I own the 13" version of both the aluminum and carbon fiber arms - simultaneously for almost two years now. I am currently using them with a SOTA Millennia Eclipse and Transfiguration Proteus and Mutech Hayabusa cartridges. I also have used them with the Benz Micro Ebony TR, Dynavector XV-1s, and Denon 103R cartridges. I have owned many arms over the past 30 years and these are the most musical and graceful I've yet encounted. Everyone who hears them is absolutely amazed and beguiled. They allow the cartridge to breath and achieve their absolute expression. A beautiful design.