I have a Britax blvd and I love it. I was going to get the Marathon but got the blvd because it was on special with a free travel cart thing which I needed for flying anyways.
I love the continuous harness. It was great for when I occasionally took my 3 year old niece to preschool. I feel like the harness is easy to buckle and adjust from both sides. Very smooth.
It was also really easy to flip around and do a ff seat belt install for my 5 year old niece. I could do any install for any size kid in less than 3 min with confidence.(I just used a seatbelt cause it was faster than Latch)
I love the latch. My sister has some other branded car seats and I can't ever get them snug. No matter how long I try or how much weight I throw into it. (I am 5.7 160 and used to work on construction) I like having the tightening ability from both sides rather than all on one side.
I drive a Ford Explorer Sport Trac. I am 6 mo pregnant. My son is 18 mo, 31.5 in. 26 lbs.
Mom to Isaac born 5-24-11 and Leah 2-19-13