While I haven't tested with the latest and greatest DET I have faired well against them with ECCM on in the past with only 2 heads... I am sure things can change though....Two head ZR5 is useless indeed against the Dragoneye. We purchased a system ourselves and installed it - IPT even with ECCM off on front and rear. This surprised even me how bad it was, I was expecting JTG with ECCM off so maybe there is something wrong with our system. But this is brand new out of the box on the latest firmware that enabled JTK. This is against both DETC and recertified DALA. Happy to demo this for anyone in the Cincy area.
I have not heard anything about 4 sensors being worse than 3, but I can test that as well when I get some time. Escort is currently telling dealers to put all 4 heads up front and buy an additional wireless ZR5 to cover the rear. They are also telling people Dragoneye is only used in Atlanta.