We have a Britax Marathon and Roundabout for our daughter and when our son arrives and outgrowns his infant seat we'll be buying 2 more Marathons. I love this seat and can't say enough about it. We have tried various other types in the stores, relatives cars, and on vacation in towncars but my daughter seemed most comfortable in her Britax seats. While in her infant seat my daughter cried every single time she was in the car, from the moment she was strapped into the seat till the moment we took her out. Once we switched her to the Britax seats we never heard a peep out of her and she actually sleeps in the car now (something she never did in the infant seat) including 3.5 hours on the drive to/from my mom's house. I like the Roundabout too, but the Marathon is bigger so we'll get much more use out of it which is why I won't be getting another Roundabout but Marathons instead.