I just installed my daughters Marathon and if I did it right I wish I had gotten one a long time ago!!! It was so easy and it's rock solid!!! Because it was so easy though I'm doubting myself. I'm including pics to show you. A couple of questions first. I'm afraid it's tethered wrong becasue if I pull out (not up) on the loop it comes right off. Also is the recline ok? My other seats have had more of a recline. She is 8 months old. Is there anything I can do to protect my leather seats? My Radian was in the spot for 1 week and it already left big indentions in the seat. Also is there a way to get the seat to move closer to the door even though it is being blocked by where the latch anchors are? I want my son to go forward facing in the middle but with the Marathon being that far over there won't be enough room. Thanks now I'm off to try the Radian again I'm having a hard time with it forward facing.