I buy three of these keyboard , silent , pro , and mac version . first impression `` unbelievably good '' . unfortunately last about two month which be about the same time the keyboard start show its `` build quality '' . squeaky key and letter fading away . I could not believe such a expensive keyboard have these problem . I have 5-6 year old keyboard I buy for ~ $ 30 , do not have these kind of problem . das-keyboard customer service : one word `` great '' . unfortunately they can only do so much within the warranty period . if you exceed 30 day , you be stick with it . they offer to replace the key even the keyboard itself if need . however this be a temporary fix . you be go to end up with the same problem since the build quality be the same for all keyboard .