Ever since I read about how safe Britax seats are, I have had my children in them.  The Marathon easy almost fool proof, especially if you are using LATCH to install it.   It has always installed extremely tight with no movement.   It's a full size seat but not too bulky, fitting even in my brother's small Scion car.   I've used Britax for all of my carseat aged/weight children and have bought one for my nephew as well.  I have yet to find another brand of seat that surpasses it in safety, comfort and ease of use.  It is plush and washes up nicely.  The straps have never twisted on me like...