Greetings,
I apologize for the "necro-post", but this is one subject that I have some unique experience in...
I was working at a software company as a Technical Project Manager for a linux-based POS system (Take that how you will...
hehe) and one day, the Executive VP comes into my office saying "Our Director of Programming needs a new keyboard." So, I quickly look at the latest shipment and find an IBM Selectric Touch M2 (? I think that was the model) with the metal backplate and sent that to the Director...
He sent it back in a week!! Left shift key broken, space bar broken.
I went back to the Executive VP and asked him what I could get the Director that he wouldn't destroy in a week! "NMB" was the answer... The only keyboard the ExecVP had ever seen survive the Director for any length of time, because the cherry-picker switches could withstand the pounding the Director would give it.
So, there
WAS a time when NMB keyboards were one of those little tech secrets you learned about because NMB wouldn't advertise. They were purely word-of-mouth. But, they were some of the best in the industry at one time.
Hope that helps.