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A 4.5 year old should still be in a 5 point harness because they're too little to use the big seatbelt. Even with a booster seat.

That said, I use an evenflo booster and it works great.

Eta- I guess there are booster seats that have the 5 point harness. My mistake.

We have the harness to booster seats, both the britax frontier and the Graco nautilus.

We have the Britax Frontier. I really like it.

Is there a diff between a 5 or harness booster and ff convertible?
I think we have to switch out my dd soon, she's not quite 40 lbs and her car seat is supposed to go to 65 but her shoulders are getting close to going above the top slot unless I missed another set.

We have the frontier as well, and like it. As Mrs. Yoyo said, it is a big seat! But both our kids are in them and our 6.5 year old has only recently started to complain about it...

We have the Diono RXT, the Britax Frontier (click tight) and Britax Pioneer (no CT). She prefers the Britax the most. The Click Tight is amazing if you're going to move it around (although it still needs a top tether so its not super easy to move).

@T.H.O.U.: @StbHisMrs: The Britax Frontier actually only requires a top tether in harness mode with a child over 65 lbs. I feel like most children probably won't be using the 5-pt harness by the time they're that big. (This is for the Britax Frontier 90; I'm not sure about older models). We have had to move our seat a lot lately so I am very thankful we have one that's so easy to install!

ETA: I realize that tethering is ideal, but technically not required for kids under 65 lbs.

The carseatblog just released a post about their top recommended seats updated for May 2016 - http://carseatblog.com/safest-recommended-car-seats/