I paid $429 for my AirPods Max a couple of years ago in one of the sales. Totally worth it. They are not perfect and I prefer my XM3's for long-haul travel, but for a headset to wear while working from home they are peerless. The transparency mode and microphones for phone calls are excellent - as is the noise canceling.
The Sony XM3's are just a better travel headphone because they can fold, and they make a better seal. With AirPods Max, I find that when I lean my head against the headrest, the seal breaks and noise leaks in. The Sony's have a leather/pleather cup which doesn't do that.
I'm no audiophile, but to my ears they sound excellent. Not everyone loves Spatial Audio, and while not everything sounds better in spatial, I do really enjoy it when it works. Head-tracked spatial is quite amazing.