As for matching compliance to your arm go to the Galen Carol Audio website--he has a nice, clearly written guide which has been of help to me in the past. (Sorry, I don't know how to do links on the A'gon). I use the OC9 on my Scout following the recommendation of Keith Herron and am shocked by the performance/price value of this cartridge. I have the original JMW-9 arm and use no additional weighting since, according to my research, the OC9 compliance match is spot on without weighting the arm. Given the right setup the OC9 is a stellar performer for the money. I have used a Dyna 20XL, 20XM and XXIIMKII and all were outperformed by the OC9 in my setup (however, all were feeding a Whest PS30R rather than my current Herron VTPH-2). I ended up selling the XXIIMKII and the Whest and for the same money got into the Herron/OC9 combo and got MUCH better results.