The model m was cheap because I literally pulled it out of the dumpster.
The endura pro was a complete waste of A LOT of money considering double shipping (usa to usa and usa to europe since they would not ship to europe, and that implies a re-shipping handling fee) and import duties on top of that.
The keyboard is loud but doesn't add anything really to my typing. And the trackpoint works at different speed if you go right vs left, and that drives me crazy (regular in a direction, super slow in the other).
Really, don't waste your money on an unicomp keyboard.
So after having played with a bit of keyboard, my favourites are the ibm/lenovo sk-8845 and a plain and simple dell usb keyboard (https://www.amazon.com/KB522-Dell-Business-Multimedia-Compat...).
That dell keyboard is very good, way better than any mechanical keyboard. So good that I stole one from my previous employer before leaving.
Mechanical keyboard is just a meme in my opinion, and one of the dumb ones.
Believe me, I've wasted enough money on keyboards to tell.