I was on here recently asking about car seats for my two special needs sons, ages almost 4 1/2 and almost 5 1/2. I got some great recommendations, but since then, my husband's car was stolen with two of our seats inside and we have to replace ASAP. My boys are now about 44 inches talls and 43 lbs. I think. Anyway, a friend offered a Britax Regent that she only used twice on long road trips. It was manufactured in 2009 so has three years left on it. Anyway, is this seat a good seat for a special needs 5 1/2 year old and how long will he be able to sit in it?