Just the omni's that I recently received distort. I know the "Church" mod is recommend for the 853 series and now I can hear why. After recording two rock concerts, both distorted. At first, I thought it was because I was using a pre-amp, but they distort with just a battery box. My lineage tonight was AT U853 (omni) > CA Battery Box > R-09HR (line in gain at 40).
Never had issues though with the cardioid or hyper caps.