I have search high and low over the year for a keyboard to duplicate the typing bliss I find back in the day with my IBM Model m keyboard . the DAS Professional , I have to say , far surpass the old IBM , in my opinion . my son find a IBM Model m keyboard for I the other day and I be as excite as one could be . I use it for for a week wait for the DAS to arrive in the mail . as soon as I type on the DAS , my love affair with the IBM Model m be history , I be sorry to say . I type a lot in my job . the DAS keyboard have the wonderful clicky sound and the amazing feel that you get from typing on a mechanical keyboard but without the strain on my finger and hand that I start to notice with the IBM keyboard . I realize after use the DAS that I have to push down a little harder on the key with the IBM than I like . not so with the DAS . I be in typing Heaven !