I have a roundabout and a marathon. Got the marathon for my second child, as it goes to a higher weight. Although, I probably didn't need it as 40 pounds they can go in a booster. I have been using it since he was 11 months, rear facing. I haven't had any problems with it, except that sometimes it gets stuck when I pull to tighten it, and I have to pull a couple times. I tried it in the stores, and it didn't do it. I am not sure how front-facing is, since they are still backwards. But overall, I love it. And...for any Britax seat...if you are ever in a crash , Britax will, one time, replace your seat for free. Not many people know that. I am not sure if it one time per seat, or per person. A friend of mine found it out. Good luck!