I have be use the Kinesis advantage for nearly two year . after a couple of week of adjustment to the contoured key , I switch to the Dvorak layout . adjust to the Dvorak layout take about a month , but during that time I still use a flat querty keyboard when I need to crank thing out for deadline . since then , I have enjoy efficient , accurate touch-type with much less hand strain . I would agree with one of the other reviewer that the function key be too flimsy . another sort-of complaint be that while you can remap the key , the key cap for the top , home , and bottom row have distinct shape , so move a key to a different row be somewhat awkward . I end up buy a set of x-keys replacement key cap -lrb- from P.I. engineering -rrb- which let you put you own legend in they . this work great for convert to Dvorak . all in all , a great investment .