I can't fully explain it - it just 'feels' right (after an initial bedding in period), I actually type /very/ fast on these keyboards - comparative to my desktop (with a Das series 4 with blue switches) which I personally found quite hard to admit (even to myself).
Obviously my experience is skewed due to not having any problems with recently low profile keyboards, but I am still quite astonished at how well I am typing not just on a laptop keyboard - but an ultra low profile keyboard.