The Britax Marathon car seat is so great!!!!  I took a lot of time to look over a dozen or so car seats when my daughter was too big for her travel system.  Everything I saw from consumer websites, to "Mom" based websites came back to Britax, and especially the Marathon.  My friends that didn't buy the Britax brand, wish they would have.

This seat is great for many reasons:

Ease of use and taking in/out of car - installing: My husband and I switch taking our 2 year old to pre-school, and this seat is a breeze to take in and out.  It's easy to snap her in and get her out.  I'm never worried...