My m1 MacBook Air is hands down the most incredible laptop I've ever owned. I've had it for 3ish years now and it just doesn't fucking stop. Battery life is still amazing and runs just as fast as it did day 1.
I've NEVER had that experience with any Intel/PC laptop, ever. Honestly I'm never going back.
that is a big part of the performance, but the battery life savings also come from clever chip design and and the fact that TSMC has been ahead of Intel on feature size for years now.