I was super excited to see the price, but I have questions! First, it is the Marathon Classic, so I am wondering if it is "up to snuff" safety-wise with the newer models? I don't care about the CS feature on the new ones, since I know to get the harness nice and snug on my own, and I don't mind that the FFing limit is only 65 instead of 70. My question is more to do with the actual body of the seat -- does the new Marathon have a broader shell around the head area? Also, how big of an advantage do you think the Safe Cell is on the newer ones? I have been shopping around for a new Britax convertible for my daughter since hers will expire soon, but I was really looking more at the Boulevard or Advocate for the extra side impact protection. At this price, though, I went ahead and bought it and figured I could think more about it later and return it if I changed my mind. We have been super happy with her current Marathon, which has been used by both of my children. Also, I plan to keep her rear-facing for a long time (she's currently 21 months), so I know that makes any seat inherently safer. Thoughts? My instinct is to keep the seat and use it rear-facing and, if I desire more head protection when she's turned to forward-facing, get a Frontier or something at that time. But, I would love any input!! Also, side note, the seat has a DOM of 5/2012.