Airpower cant be a disappointment since it never released. All these items are very niche and not mass market devices. They're products nobody NEEDS like a phone or a laptop/desktop. They won't be for everyone, however the people that do purchase them generally enjoy them. I will say from my personal experience HomePod is just not close to the experience I have with my Echo Show 10 and I was not overly impressed with the AirPods Max in the Apple Store when I did want to purchase them. Not everything will be a hit.
Vision Pro - Not for everyone just for the price alone, but it is one cool device and a unique experience you won't get anywhere else. Headsets are just a hard sell long term, unless everyone is wearing one. I have purchased multiple VR devices for gaming over the years and they're always exciting initially but then I get sick of pulling it out and putting it on. I think that will similarly happen here especially if it's as heavy as everyone says. I can't justify a $3,500 IMAX device as much as I want one. New golf clubs are more fun.