the aircross is roomy and a comfortable drive be it a bit more wallowy than the mini. be interesting to see a 7 seater in the flesh to see what effect it has on the boot etc. as its cheaper.
None essentially, as the third row seats will never be in there upright position and in reality no different to the 5 seater. Of course if you were to a family who need all 7 seats , there will be very very little boot.