Quoting Booger & Bubba's Mommy:" The my ride will be out grown much sooner than the nautalis. The my ride is a convertable seat. The Natalia ... [snip!] ... a taller harness height than the my ride & becomes a full back booster & a no back booster. The my ride doesn't booster at all."
Yeah, I know. The weight max on the MyRide is 65lbs & height max is 50 in. I'm thinking by the time DD reaches that she'll be big/old enough for a simple no-back booster seat. Which i wouldn't care to buy cause they're pretty cheap.