"As our youngest outgrew his infant seat, we moved him up to our Roundabout and our toddler up to the Marathon and purchased this for our 4 year old. Although she could *technically* sit in a booster, we were not comfortable with that. So when this seat came out, we were so excited. Now as a 5 year old, she still uses the 5 point harness and can actually get herself in and out. She sits lower/closer to the actual car's seat and loves her cupholders;) She's very comfortable in it, has been on many long (14 hr) trips in it and has never complained. Even sleeps well in it. Installation was a little different from the other Britax seats, but once I figured it out, it was a easy. I feel very confident that she is safe and will eventually use the seat as a booster (a booster latched to the car!) as she grows. Already considering another for our 3 year old (expecting another baby;). Only complaint-fabric is not as great as the other Britax seats. Still removes easy to wash, but has really snagged alot. Especially in the crotch and leg areas."