I’ve had the base MBA for nearly two weeks. I had a couple of minor issues during the first few days—iCloud went funny (possibly a Big Sur rather than M1 issue) and my 2007 ACD refused to connect using a usb-c hub. iCloud sorted itself and I got a usb c to hdmi adaptor and that took care of the display issue.
Weirdly, the quality of the display looks so much better than it did on my 2013 rMBP. The colours are richer and I swear the thing is sharper too for text, which is bizarre as my main device for everyday use is the 2018 iPP, and I worried that using an older display would be painful to my eyes. Hasn’t been a problem. The only thing is, I find that if I leave a display and wired mouse plugged in I obviously can’t also charge the MBA, and the one time I did that overnight was also the only time I’ve seen super fast battery discharge. Usually I’m getting three to four days between charges, although granted I’m only using the machine for maximum four hours a day. Fantastic, fantastic laptop—incredible value for the price.