This is a really good family car, it easily fits any combination of 3 child seats and has built-in sun blinds at all 4 rear windows. There is also an extra rear view mirror so that you can easily keep an eye on the kids in the back. There is space for a big rear facing child seat, I have a Britax Multi Tech behind the passenger that my youngest child will be using until she is at least 5 and there is plenty of legroom left for the front seat passenger.
The very rear-most seats, pulled up from the boot floor have a decent amount of legroom. For a child you don't have to move the middle row forward at all, and for an adult (yes, these seats are suitable for adults but probably not for hours on end during a long journey) you only need to slide the middle row forward slightly. The downside of this decent legroom is that the space left in the boot behind them is slightly disappointing. There is only space for a umbrella-fold buggy, with a couple of bags on top. You do however get a decent amount of space underneath the rear seats, in the gap that they have been pulled up out of.
Mine has a 1.6l Diesel engine and it's great, really powerful and lovely on the motorway. I initially test drove a petrol one and it was awful!