have used this car seat since my DC was 9 months old.
The front body bar holds him firmly in place and he's not the biggest of children. He has never escaped from behind the bar and they never will if you put it in correctly.
With it having the ability to be iso-fix as well as just placed in the car it means it can go in any vehicle.
My DC has now a reduced risk of whip lash and when he falls asleep I can slightly recline the head rest as well as the actual seat meaning he doesn't lean forward like most 5 point harnessed seats.
This will last until he no longer needs a seat. I will be buying one for my second child.