Buckling springs!
The Model M (and its older sister, the IBM Model F) is famous for its buckling spring switches and they are even better than I imagined! I'd say the switches need more pressure to depress than the average keyboard, but less than a typewriter. When you press the key deep enough, the spring in the switch buckles, making a sound and sending the keypress to the computer at the same time. This buckling also lowers the "resistance" of the key to being depressed further, which makes for excellent tactile feedback. When releasing the key, the spring goes back up, making a metallic sound. Something about my brain really enjoys the metallic sound of this keyboard over the more "clicky" sound of most mechanical keyboards. The sound alone is a big reason why I love this keyboard. Buckling springs are definitely on the loud side, if you value your keyboard being quiet, the Model M is likely not for you.
Should you get a Model M?
If you want a reliable keyboard that can survive a nuclear war, has a metallic sound, 90s beige look, great tactile feedback and you type a lot, I think you'll love the Model M, it's one of the best keyboards ever for typing in my opinion! If you need your keyboard to be quiet, small and/or lightweight though, I'd look for something else. If you're a competitive gamer in games which require quick reaction, the Model M might not be the best for you either, as the above-average force needed to press keys might make it perform worse than a lot of keyboards designed for gaming. However, I think the Model M is great for casual gaming and for slower games, where reaction time matters a lot less, definitely much better than a bog-standard rubber dome keyboard.
I mostly use my keyboard for typing (writing, programming, texting, command line) and for some casual gaming, mostly singleplayer, so I find my Model M perfect for me! I wish I bought it earlier instead of using cheap rubber dome keyboards for so long. I think the only keyboard that might ever replace it for me is the Model F, which I heard is even more indestructible and has an even more metallic sound. They tend to be much rarer than Model Ms.
If you decide to get a vintage Model M, don't overpay for it! The "wide" (with numpad) PS/2 models, AT models and terminal models are not rare, millions of them were manufactured. If someone lists an old untested keyboard for a ridiculous price like $300, that doesn't mean anyone will pay that much for it. Some variants, like the spacesaver (without numpad), are actually rare and are worth a higher price.