I bought a Bose A30 last week and am quite impressed. With the noise cancelling the radio is like listening to a speaker playing in a quiet room and I don't need the volume turned full up like I did with my previous headset. Suggest low or medium setting if you're on a jet as maximum drowns out too much and is better for piston or turboprop. They appear slightly more fragile than a pair of David Clarke's so always keep them in the case when not in use. Quite comfortable to wear and they don't slide around. Bluetooth is useful if you want to listen to music or watch a film while deadheading. If your aircraft supports the XLR powered pin, there's no need to worry about the batteries.
Overall very pleased with them, not cheap but have given me a huge improvement. They retain their value quite well and are easy to sell if you change you mind later on.