Happy owner of 5 original IBM Model Ms here, plus Das Keyboard, Apple Extended, 2 x Apple Extended II and others.
If you don't like "normal mechanical" K/Bs because they're loud, you will not like a Model M. They are much, much louder. I don't know any 21st century keyboard that's as loud as the real IBM deal.
When I moved to Czechia in 2014, I took a Model M in my suitcase, in the spirit of "accept nothing less than the best."
People crossed the floor of my open-plan office with 40-50 co-workers to ask what I was typing on. People multiple rooms away asked what the noise was. My boss' boss, in his own private separate room, said my "typing sounded like rain." Heavy rain, outside, he clarified.