Great seat for older kids - wish it went to 145 cm
I bought this a week ago for my 7 year old, as I tried him in my daughter's (5) Safe N Sound High Liner which was a little too snug for him width-wise (even though he's slight).
Super easer to install, it took less than 5 minutes. Child looks very comfortable in it and can easily buckle himself in. The seat area is nice and narrow, so he doesn't have to fish around getting the buckle in, he can see it clearly next to him. (Old seat it was almost underneath him).
One thing to note it doesn't have cup/bottle holders, but payoff is that it's slimline.
You can make the "wings" wider and the seat deeper to fit, so I can see him using it for a few year. It's suited for 4 - 10 years or 135 cm. The only drawback is it fits to 135 cm and you children are meant to stay in a booster til 145 cm according to Britax website. I had assumed this seat would see him through!
I believe the Kid Guard Pro goes up to 145, I should have shelled out the extra $100.