Has anyone had experience of the ANR in these HGU 55/58 headsets?
I found ANR entirely unnecessary in the helmet. Helmets of the HGU series come with the option of either DC type earcups inside (mine have oregon aero hush foam earseals), or the standard "elephant ear" style. The elephant ear style are noisier, and don't have an ideal earseal for applying ANR anyway...but they're more comfortable. The earcups provide better impact protection, seal better against noise, and in my opinion, don't need ANR. It's a wasted option in these helmets...based on experience in some noisy cockpits.