I received my 16" M1 max MacBook Pro yesterday and have been testing out FormZ 9.1 and Maxwell... It all runs. FormZ isn't nearly as smooth as I would have expected from all that GPU power, but Maxwell does render a LOT faster than my old i7 MBP. That said, I expect much greater performance once these apps are optimized. I hope this will not require that we wait multiple years, but with FormZ and Maxwell... well, sometimes things take time.
I will be doing more testing with other 3D apps and renderers to validate what I'm seeing in FZ9 and Maxwell 5.2. I'm not dissatisfied at all... but I am anxious to see software running natively on these chips.
Oh, and for those who care... all-day Maxwell rendering and modeling at the same time, zero fans. Zero.
As for the cost of this machine (+$5k Can) it's a lot... but my last MBP was a 2013 i7, fully specced out and it has been running and rendering for 8 years without a peep (still running the very latest OS update). Only thing I swapped was the battery last year. In comparison, I've never had a PC laptop survive more than 3 years usably. You get what you pay for, and with Apple, it just works. And lasts.