I have been using mine (64GB with Ubuntu 21.04, Gnome Flashback) for the past several months as my primary work laptop. I have not experienced any of the issues you mention. I like it so far. In fact, hardly notice it. Except maybe when I do sudo/login. I can use my fingerprint instead of password :). My earlier laptop was a 2012 MacBook Pro which gave up last year. I do have an M1 which is used exclusively for iOS dev.

I did have to tweak few things mentioned in their community page/forum to get everything working.

Two issues (which hasn't bothered me yet)

  - battery drain during suspend
  - gnome not supporting different scaling with multiple monitors (fixed in later version of gnome as I understand)

edit: formatting