My first set was ANR Sennhieser way better than bose A20 (my opinion)then for aerobatics I got the Bluetooth clarity aloft haven't taken the sennhiesers out of the case since except for passengersn Quiet clear and no more clamping of the head.
I have a set of noise cancelling Bluetooth Sennheiser which are excellent and then got a set of Clarity Aloft with Bluetooth Have not touched the Sennheiser since
Superior cylinders are alodine treated for corrosion lycoming are not, Hence the need for paint, polished fins are a PIA just like polished motorcycle parts lots of elbow grease to keep looking good.