Mitch, I haven't had cardas in my system but I own Goertz M2's. Between my classe and thiel 3.6 I get punchy bass, a smooth fat midrange, nice, clear and fairly extended highs. Imaging is very good. The midrange is anything but hard, it's rich sounding. Not as much air as MIT 750+. Also the MIT's have a better sense of decay which I believe gives the soundstage a little more air. All of my ic's are reference MIT so Goertz might perform better with a different setup. However, the goertz still sounds very nice but the MIT is better under my circumstances. Hope that gives you some insight.