We started out with the Como (sister to Signo) and we hated it. The base was too high, even for my grand caravan, and it offered almost no leg room. My son was only 6 months old when we got the seat and he had very little leg room at the time. The RA50 is a nice seat that is very similar in shell height to the Marathon. The 50lb harness limit is more realistic to the size of the seat. The leg room is ok but not the roomiest. I don't have real life experience with it but if it installs like the Marathon it will be pretty easy. We love the True Fit. It offers tons of leg room and has the highest shell for convertible seats. My tall 27 month old is 38 inches (14-14.5 inch torso) and still has at least 4 inches of shell above the top of his head. My son is on the heavy side and reached 35lbs last month so he is no longer able to rear face in it. We LOVE our MyRide because of the 40lb rear facing limit but the shell is similar in size to the Marathon and RA50. He has about 2.5 inches above the top of his head so he has a few more months of rear facing time. The leg room is better than the Marathon but not as roomy as the True Fit. If it were me, I'd get either the True Fit or MyRide