I just got back into flying after a long hiatus, so I recently completed an extended (~ 20 hours dual) BFR and checkout in C-172/182. I started with a new DC H10-13S (PNR), under $400 (Sporty's). When I finished I wanted to upgrade to ANR/BT and have the DC as a spare and for a passenger, and initially planned on adding one of the DC ANR's: ~25-30% cheaper than the Bose and I was happy with DC already (and liked the "classic" green). But I found a used pair of Bose A20 for about the same price, so I jumped on that. I've used them a couple of times and am happy. But apart from the BT (which I haven't used yet), the side-by-side comparison of the DC and A20 isn't that exciting. The excellent PNR of the DC almost equals the ANR of the Bose, at least in my ability to notice. Comfort is very similar. I'll keep and use them both, and although I plan to soon take advantage of the Bose BT functionality with Foreflight traffic advisory, as a pure comms headset the DC was much more value for the money. For me. If the airplane I fly had ADSB-in for traffic, I probably wouldn't "need" the BT and would just have two DC PNR headsets for less cost than one A20.