Extremely happy. I've been using Windows for 25 years, since i was a kid, and while I still continue to use Windows, the M1 was the moment that finally convinced me to give macOS a serious try. Up until the M1 i had used iPads and iPhones for years and years, but the M1 was when I finally changed my daily workflow and jumped into macOS 100%
The M1 is truly a paradigm shift in personal computing, incorporating excellent day to day performance, portability, and insane battery life, in a neat, clean package. Up until this point i had been suggesting the Dell XPS13 to everyone considering a new laptop, but the MBA and MBP are now at the top of my list. I personally don't feel there's a better, more comprehensively equipped laptop for the price.
I'm currently on a 512GB MBP 13" with 8GB of RAM and i've honestly not noticed any performance degradation despite the hundreds of tabs i have open in Chrome. I've got dozens of apps running in the background ranging from Photoshop, RoyalTSX and SSH for server management, Apple Configurator preparing iPhones in the background, Outlook, Word, Excel -- point is, everything stays open, and the MBP doesn't skip a beat. At this point my Windows laptop running 16GB of RAM would be struggling.
if a redesigned 14" MBP is released it'll be a day 1 purchase for me. The 16" is too large and unwieldy for me.