I bought a pair of CM-3's a year ago and having used them for eight or ten shows I think they are excellent mics. Accurate, realistic sounding but still with good response in the lower frequencies. One thing though - I thought they were cardioids but they sound like they're halfway to omnis, which suits me fine since I'm an omni guy myself. In ORTF and DIN these mics make a good stereo image; however, maybe more distance between them would have thrown a better soundstage. I think I would try 25cm to 30cm and 110 degrees, or 30cm and 90 degrees. One time, due to poor planning, I had to deploy them as a main pair in spaced omni formation, with about 8-10 feet between them. To my surprise, I was still able to get a decent stereo image, with a solid center, no hole in the middle. I must disclose that I almost always record on stage or just in front of the stage, loud guitars/bass/drums stuff in clubs, and your situation may differ.