sadly enough, i'm focussed on riding the x10 right now
i had two runs on the x3 so far.
16m in light winds.
the handling felt smoother than the x2, the power came delivered softer, but the low end grunt was way better than on the big x2 sizes.
12m in super gusty winds:
the handling felt really really good, i liked it a lot more than the x2.
but i don't like the 12m x2 that much (just a personal opinion).
kite turns fast, reacts good to the boardedge and has heaps of power.
the three middle struts are connected really tight to tle leading edge.
the velcros are improved and the kite has a pump-leash.
the line connectors look a lot nicer, it's male connectors for the frontlines and female connectors for the backlines.
these are some rough impressions after two short sessions.
i didn't have time/wind for more (i don't know about the other guys, but that's how it looks here)