If I remeber correctly the RA50 (Roundabout50) is a MA (Marathon) without all the "extras". No HUGS (the plastic thingies on the harness), no LATCH bars but still can be teathered while rear-facing. It also "only" harnesses to 50lbs but most children outgrow seats in height before weight.
I honestly would chose the RA50 over the MA if given a choice.:twocents:
:yeahthat:
I have both & I love them both. Mostly, I just love my girly cover for my MA, and that's why DD has it. Plus the RA 50 wasn't out yet.
The only differences:
RA 50 has 3 crotch buckle positions, MA has one
MA has comfort & belly pads; RA 50 only has belly pads (this I don't like for little baby, but I may make the parental decision to borrow them from a MA. DISCLAIMER: BRITAX DOES NOT ALLOW FOR THIS!!)
MA has HUGS, RA 50 does not.
MA has LATCH bar, RA 50 does not
RA 50 goes to 50... MA goes to 60 (my almost 6 year old still fits in both... barely, but he does. And he only weighs 40 lbs!!)
HTH!!