I haven't compared the two directly, although I've heard both and have owned the Opus. And, unless I'm wrong, they are at different price points -- 5.5k vs. 3.5k. Anyway, I think you'd be hard pressed to find glaring differences. The Opus offers the most felixbility, which is why I bought it.
If you're willing to pay the added price of the CD3, one thing to consider is the Great Northern Sound Co. modification package for the Opus, which improves the unit. GNSC also works on AR stuff so they might be able to give you a decent answer, although I don't think he mods the CD3. There's a review of the GNSC Opus here on the Gon. Good luck!
If you're willing to pay the added price of the CD3, one thing to consider is the Great Northern Sound Co. modification package for the Opus, which improves the unit. GNSC also works on AR stuff so they might be able to give you a decent answer, although I don't think he mods the CD3. There's a review of the GNSC Opus here on the Gon. Good luck!