Originally Posted by katie9143
i would buy the marathon if i were you - we love ours. i have heard that even tho there are a few seats that rf to 40lbs, that most kids are too tall. idk - jmo
The Graco MyRide has a 40lb rear-facing limit and is the first seat in the US to do it
However it has roughly the same harness slot heights as the Marathon so it probably won't get all kids to 40lbs rear-facing. The tallest seats on the market right now (convertibles) are the Radian and the TrueFit. After that is the Evenflo Triumph Advance, then I think the Recaro Como & Signo, then the Marathon, which is just a hair ahead of the Boulevard.
The Radian and TrueFit stand the best chances of getting you to booster age. With the others, it's likely that you'll need to buy another harnessed seat in 5-6 years. All of the other above seats mentioned have a 6 year expiration (from date of manufacture, NOT date of purchase), except the Radian is 8 years and the TrueFit is 7 years.
I think the Recaros are also 8 years but don't lend themselves well to extended rear-facing because they leave very little leg room. Also, the Britax convertibles have very little leg room rear-facing. The Radian and TrueFit have loads of leg room in comparison.
(and plus the TF is quite possibly the most padded seat I've ever felt)
And if the Marathon is that much on sale somewhere, it may be an older date of manufacture, meaning you may only have 4-5 years out of it instead of 6.