My DS has outgrown his Britax Boulevard and the logical choice for safety for us after doing extensive research was the Britax Frontier 85.
My husband does not think Britax did a very good job with it, it is more difficult to install than the boulevard and the bottom of the seat cover keeps coming off which is annoying.
I called Britax to give them our feedback, but they did not seem to care.
We are sticking with it because my DS is very big for a 4 year old and we love the harness system, we just expected a better product from Britax because we are so happy with our Boulevard.
We travel ALOT, so there is a lot of movement with the car seat.