The holy grail of keyboards was the MSFT Natural I bought in 1997. Hands down the best keyboard ever. Classic layout, no stupid media keys, ergo form factor. LOVED IT.
Tried to restore it last year. Failed :(. Now using a newer basic Natural keyboard that is…ok.
My problem with the Media Natural keyboards is the ergo form does not seem as pronounced. The last one I bought broke relatively quickly, too…only lasted a year or two.