Your right, the urethane will have more flex than a heim joint (spherical bearing), but most of the quality LCA should have zert fittings for lubing...thus no noise. Idealy they should use delron instead of urethane, but delron is more expensive and is a harder compound. Like a heim joint, more suspension shock noise will ocur. That's why I went with the CA-5 MM LCA in the hope I could get the best of both worlds. It's the uppers I was more concerned about because they needed to be adjustable for the pinion angle setting, especially if your car is lowered. I haven't had any issues with MMs urethane bushings at the chassis coming apart and I've got over 400 hp.