this thing take a bit of get use to , but the only flaw I can find be the placement of the single space key under the right thumb and the inability to adjust the angle on the keypad . I would rather have a second space key under the left thumb and move the backspace key someplace else , and be able to adjust the distance from each other and angle to each other of the two keypad . still , after just a few day , the weird , chronic pain in my elbow and forearm be begin to dissipate - which do not happen with the cheaper keyboard I have purchase over the year -- and the keyboard be begin to feel incredibly natural .