I'm considering a refurbished AWU. I was thinking I'd like the AWU 1 for the O2 sensor. Then I got to wondering how much I'd really pay attention to it. I have it on my AW 6 but rarely look at it. I also have a Garmin Fenix 7. That has it. It takes a few more steps to use it. But, I rarely check it there either. Am I the odd man out? I've seen comments where some people won't buy another watch until the sensor is back. I'd like to know if this thing really gets that much attention.