Hi Perfrej, agree that Bose is the best head set.I have is the past retro fitted ANR into a gentex SPH5 and the results were good. The biggest differents was turning the radio volume down from 80% back to 40% and still hear it and this is in a Lama. I think I have a bit of hearing damage due to exposure to aviation. I can turn the radio on (ADF) to a normal level and when I turn the ANR off I can not hear it at all. About to retro fit ANR into a new Alpha Eagle so will keep you informed.Back in a 500 at the moment and the Alpha was not good, so back to the SPH 5 with ANR so this is the reasons for the up grade