I have an M1 Max MBP now and it has been absolutely perfect.
My favorite and most painful issue was a bug in USB charging. Sometimes it would fail to charge from my monitor (USB-C) yet it would believe it’s connected. The battery would eventually run to zero and the machine would shutoff without warning. No low battery warning would be shown because it believed it was charging however it was not. Resolved with my M3.
Also fun with that generation is that you can’t plug in a dead laptop and start using it right away. Takes about ten minutes of charging before you can power it on.
Also fun, it would not establish power delivery with my monitor in this state. I’d have to plug it in with a regular charger to bootstrap it. Also resolved with my M3.
Now that it’s aged, the super capacitor for the clock no longer holds charge and the time is usually wrong on cold boot. I wish that was serviceable.
It was the third Asus computer I had owned that broke way earlier than it had any right to, and I swore a blood oath that I will not buy another Asus product.
Point is, considering how terrible that laptop was, “annoying thermal throttling” was still a considerable upgrade, so I loved it in spite of it.