This was the only car seat my son used from the day he went home from the hospital until our second son was born 21 months later. Our second son is using it now. We have been very pleased with the quality and durability of the Britax Marathon seat. Here are my favorite things about it: 1. The shoulder belts are very easy to raise or lower. 2. The latch system and tether belt get this seat in the car very securely. 3. I like that the sides of the seat extend forward around the child's head a bit; it seems very safe. 4. There is enough padding to keep children comfortable. 5. The rear-facing weight limit allows children to stay rear-facing longer; my older son still fits the weight limit at almost 2 years old. There are a few things I don't love: 1. If you use the Infant Positioning Insert (also sold by Britax) to help newborns fit just right, it is difficult to get in just right, and it's hard to find instructions online. 2. The clip you have to squeeze to get the shoulder straps to loosen is hidden under a fabric flab, and it's difficult to reach. I wish it were easier to loosen & tighten the straps. Overall a great carseat!