I need to move my 45 inch, 38 lb six-year-old from her convertible carseat to a harnessed booster. She currently CANNOT unbuckle the crotch of her own carseat (Maxi Cosi Pria), and I'd like this to change in her new seat. I plan to use the harness until she hits at least 40 lbs, but probably 45.

Do you have a harnessed booster that your child finds easy to unbuckle?

I'm specifically looking at Graco Tranzitions, but open to other models, and she'll be sitting in the back row of a Honda Oddessey.