"Finest keyboard ...ever"
"the finest keyboard in the world, ever, is the IBM Model M."
well...no. "ever" is a very long time, even in IT.
Let's ignore that people vary, and people can legitimately love/hate different things. There were a lot of options out there before the PC and some were just plain better.
Let's not forget, when IBM came out with the PC, the keyboard was laughed at by many, loved by some. I recall one review (Byte Magazine?) which summed it up as, "how could the company that produced the IBM Selectric Typewriter produce ... THIS?"'. In addition to the weird feel, the weird key placements were just out of line.
The later 101key Model M fixed the placements (for the most part. CTRL moved stupidly). So now it was just the feel. Love it or hate it.
When the IBM clicky keyboards came out, I hated them.
Now, I think a Model M (or a clone -- Unicomp) it is the best I can find. Not so much (I believe) because I've changed my mind...it's just that better computer keyboards went away. There was a lot of good stuff in the Pre-PC world (and a lot of trash, too -- admittedly).
My favorite I've owned: Zenith Z100/Heathkit H100 (a PC class but not PC compatible computer). I used to have people come to my dorm room and say, "I have heard you have a computer with an amazing keyboard, can I try it?"...and I don't recall anyone walking away saying, "eh", except for the rabid IBM lovers (the ones that didn't even want to talk about compatibles -- 4.77MHz 8088 and 6MHz 80286 are enough for ANYONE! After that -- get an IBM Mainframe!). I've used an IBM 3279 terminal which also had a stunning keyboard, though I wasn't using it for "PC" style applications, were I could just type fast, hard and long -- so I'm not sure if my admiration would hold up. And yes, the purely mechanical IBM Selectric golfball typewriters had stunning keyboards. No switches, just rods and levers causing things to happen, and giving the user an amazing experience (except...that backspace key doesn't "work" like I need it to).
Before I ran out of supply, my favorite PC keyboard was the Zenith ZKB-2. Now, if I can avoid a PS2-USB converter, a real Model M is my favorite (I have a lifetime supply). Unicomp is good -- very good -- but feels a bit like a worn Model M. Really good, but not quite 100%. And I wish they'd improve the features, not just clone 40 year old keyboards (i.e., their trackball and button mouse keyboards are fatally crippled by lack of the seemingly required modern wheel and third button functions. Some programmability/macro functions would be nice, too). PS/2-USB converters have been hit-and-miss for me. Some work well, some are laggy. I'd gripe about breaking a Unicomp by spilling some water in it, but I managed to do the exact same thing with a real Model M a few weeks later (40+ years in the business, and the two keyboards I destroyed were just weeks apart!!), so I guess that's authentic.
One GREAT thing about the migration to commodity PC hardware: you can get a keyboard that works for you and put it on your computer that works for you with the monitor that works for you. One sad thing is people cheap out on the very things they interact with the most (monitor/mouse/keyboard), and go for fancy and expensive stuff in the computer's box they don't actually use 80% of. Go buy a good keyboard. $150USD is nothing for something that will make your life better and improve the experience. My only gripe is there few places you can walk in and try out the high end keyboards before purchasing (I'd like to try the Model F clones...but I'm not quite ready to drop $400 for an experiment. If it is good, I'm fine with the price).