1. Britax harness straps don't get twisty or scrunchy like these other seats:
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I have owned a Britax Roundabout for over three years. The straps are still perfectly straight and not scrunchy:
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This is our other Britax, a Marathon that we've owned for less than a year. You really can't tell that the Roundabout is any older:
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2. Britax seats come in cool and funky colors and patterns. You'll have to ask the Assitant Gardener why our colors are very tame and unfunky.
3. Britax are so easy to install. I've installed a lot of seats and Britax are easiest by far.
4. Many Britax seats have True Side Impact Protection.
5. The Companion infant seat has a higher weight and length limit than other infant seats. This made a difference of over 6 months of usage for us!
6. The Companion infant seat has an anti-rebound bar.
7. Britax seats can be tethered rear-facing. Other seats can't and are much harder to install and stabilize rear-facing.
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Yes, Fat Girl is still rear-facing at 17 months and over 25 pounds. Children should stay rear-facing for as long as possible.
8. Britax seats allow children to be in a 5-point harness up to 80 pounds!
9. Britax seats have convenient belt holders that hold the straps aside for boarding.
10. Britax seats exceed US Safety Standards.
I love Britax!