Once you mastered the Kinesis Advantage you don't want to go back. Your hands move way less on the Kinesis than on a normal keyboard. Maybe this is also the reason why I always found the use of ESC in vim an odd choice, i.e. you have to move your hand to reach the ESC key. Moreover, the Kinesis has the arrow keys below the "c" "v" "m" "," keys so you can navigate without moving your hands, this is similar to vim but without the annoying mode switches.