I have be use split keyboard since 1995 , all Microsoft . I could tell the current keyboard -lrb- of 8 year -rrb- be begin to skip letter as I type -- warn signal ! so I purchase a new one which have now move to storage until I be simply force to use it : 1 -rrb- keyboard click be sharp or tinny -- I think due to the thin material use for the housing . 2 -rrb- the keyboard speed be maddeningly slow . I have try the new keyboard on both xp and win 7 , set both OS 's at the highest speed and still the keyboard creep until I want to throw it out the window . regular typing be ok , but if you want to move the cursor to somewhere else on the page that have no keyboard shortcut , take a long deep breath . delete , whether forward or back be also annoyingly slow .