I've also been using it on a 14" M1 MacBook since launch (Oct 2021). I'm currently at 86% battery health.

I keep it at ~80% limit normally with occasional charges to 100% for long trips, etc. I do spend a lot of time on battery though so it's charging and draining a lot, but rarely goes above 80% charge.

Thanks for posting your results, I'm curious just how much the charge limit helps battery longevity.

I wish I had discovered it earlier... I'm at 90% battery health on the same model which I use plugged in the vast majority of the time.