The AirPods Max microphone is great as long as you use it with an Apple device. You might also get good results with some Android flagship devices, but it depends on how well they can handle wireless audio transmissions. Below are a few examples of what you can expect the microphone to sound like.
Apple AirPods Max microphone demo (ideal):
Apple AirPods Max microphone demo (office):
Apple AirPods Max microphone demo (street):
Apple AirPods Max microphone demo (wind):
Apple AirPods Max microphone demo (Huawei laptop):