I do not like the design of this keyboard compare to other natural\/ergonomic model . I particularly dislike the design of the spacebar . it addition to be extremely noisy when press , the spacebar require more pressure than a average keyboard to use . because of the raise slope design in the middle of the keyboard , this be actaully cause the tendon from my thumb into my wrist to ache - and that be the first and foremost reason I use a natural\/ergonomic keyboard . I be quite uncomfortable after write just a few short email and have to keep stop to stretch my wrist . I will be return the keyboard and try to find another replacement that I like better .