I just ordered the Britax Frontier for DS from albeebaby.com. We have two Boulevards (why I didn't just move DS to the high back convertible when DD needed a Boulevard I don't know...Oh, hindsight!), and I love them. I can't imagine based on that experience and the research I did before buying the Frontier that it would be any less impressive. DS also tried one out at BRU and said it was very comfy.
Re: Recommend your high-back 5-point harness booster
We have the Evenflo Maestro for DD in both cars and I really like it.
DS~4 years old~born November 6, 2010 (1st year of preschool)
My Easy Cooking Blog
At 3 we moved DD to a Britax Frontier and love it. The straps are easy to use and like our other Britax seats the fabric holds up very well.
This as well.
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