i have used my x3 14 and 20 a couple of days
and my destinct feeling is that the 14 gives you more airtime,
not a very big difference, but enough to notice .
this is noticed especially when the kite is tuned to max speed and power
with about equal power in all lines.
When it comes to the 20 i am not quite sure yet
I used my 20 most of all kites last year
and x3 is definetly different, i just cant find the right words yet.
but it flies different
maybe a slight wobble in the jumps
but the glide is longer
it has more power
but i cant say if i goes as far out to the edge of the window
but i was tuned for power not depower.
i had big relaunch problems with the 20
and i have now rigged a fifth line after a long swim monday