None of them have lasted, or had the build quality, or felt as nice. More than a few have been actively irritating. The silly price Roccat was the least reliable of the lot.
I keep coming back to my M. If it's placebo it's a convincing one.
I think I get less fatigue. For example on my laptop, I feel like I keep hitting my fingers on hard surface and it gets tiring and they hurt a lot sooner than when I type on my Model M.
On laptops, Thinkpads have the best so far I've seen (tried Acer, HP, Macbook Pro).
With physical excretion, it is an interesting point. I just bolt modded my Model M (that means replacing some of the aging plastic rivets inside with metal bolts, which requires a complete disassembly and drilling holes and so on). And so for a while was using a generic keyboard with Cherry MX blue switches. Also clicky but a lot less resistance.
When I switched back to my fixed up Model M I noticed my fingers were weaker and it was hard to type. After a bit of time on it was back on track. I think fingers get stronger or get used to it perhaps.
But I totally don't discount this being a placebo effect. I know I am irrational about being attached to this keyboard. I just spent a large number of hours fiddling with it, ordering custom parts, and so on. If you ask me I'll probably tell you my program compile faster too when I type them on it ;-)
I learned to type on a Model M keyboard. But are they actually better? Or is it all psycho-somatic? I don't think I type any slower on a modern scissor-switch keyboard. And frankly it's a lot less physical exertion and not to mention quieter.