I've got the 3 GTT braces, Koni FSDs and Eibach springs on my MSCS, the Konis and the Eibachs were supplied and fitted by Lohen. I've been really pleased with them, the handling is amazing
Where are abouts are you? If you wanted to have a try before you commit I'd be happy to take you out for a spin if you're local (I'm in Birmingham)
My post from the other thread: