My daughter will be 3 in June. She is very tall, over 40 inches already. I don't know her exact height cause we have not been to the dr since her 2 yr old appt but a classmate of hers just had her 3 year old appt and was 41 1/2 inches tall. And my daughter is taller than her! But she is also very thin, barely 30lbs. She has been in a roundabout and her shoulders now are even with the top harness slot. I know she can stay like that until they go over it but her legs are so long she looks very uncomfortable in it. I was considering the Nautilus or the Frontier (we have a SafeGuard Go in my husbands car - which we drive VERY infrequently - and we like it but only for a second car, does not offer much protection for everyday). Is it too soon to put her in a hybrid booster (Nautilus or Frontier)? Or should I buy the Marathon and then move to the GN or Frontier when she outgrows that? Or is that just a big waste of money. I figured if I did that it would give these companies time to fix all the issues I have been reading about on here! Any suggestions?