I bought a set M20 caps and Nbob actives back in 2015. I eventually sold them. Then after listening to my WSP Red Rocks pulls a few years later I sold of all my schoeps gear and put together another M20 Nbob active rig. Makes great recordings. Mine is a KCY setup I did that so I could run it with my VMS 5U, IPA, and PFA's. Gordon posted a ak40 vs M20 comp over in the mic section if you want to listen. He liked them enough to move to Microtech Gefell.