I had an OC-9 years ago, remember only that it sounded kind of thin which is why I replaced it. No idea how it would compare to my current Zephyr which I like a lot. I'm running it on a JMW 10.5i arm and my only concern was that it was something of a low rider until I talked to Peter and got his recommendation to raise the rear of the arm and run the Zephyr at 1.4g.
