I think i answered most on FB, but here goes....
Bought one 3 months ago, LOVE IT!!!!!!!!

We have 6 kids in the back, and it does have a GREAT boot....we can fit all our holiday crap in it, no worries!!

Now, with car seats, there are anchor points in the middle row, no good if you have kids that need to get into the back seat.....so....
We got 3 anchor points put in the 3rd row, and have all 3 car seats together, fit perfectly too..., that way we put the 2 bigger boys who can walk to their seat, on the further side, and H in the one closest to the door... this leaves the middle seat free for the big kids to get in and out of... does this make sense??
That way we leave the single seat in the middle row on the right hand side tilted forward at all time, giving direct access to the back seat, and only put it back if we have all 6 kids in at once, which rarely happens...
Drives beautiful, and can go everywhere a normal car can, but its heaps big inside!

I previously had a Hyundai Trajet, and loved it too... nothing wrong with a Hyundai!!!

eta... I just used the car seats we had, there not slim line or anything just run of the mill Mothers Choice etc....and they fit great, the iMax are supposed to be "full sized seats" all throughout the car....and I think they are...