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My only suggestion is to remember that the Roundabout has a smaller HEIGHT max, too. Most kids outgrow car seats by height before weight.
According to Britax's website:
Roundabout goes to 40lbs (forward facing, rearfacing is 35) and 40 inches standing.
The Marathon is up to 65lbs forward facing, (35 lbs rear facing) and 49 inches for a height max.
The decathalon and boulevard have the same height and weight max. as the marathon. They just have additional padding, which when we tested them out, weren't as comfy as they looked for DS.
That being said, I bought two marathons for DS because I want to keep him in a 5 pt. harness for as long as possible.
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