We bought it when he was about 2.5 (previously I had the Maxi Cosi Foray but hated that you can't fold it in one piece). I think he's probably average height so not sure how being tall would affect him seat-wise. Have you been able to test it out? I took DS to BRU one day to try it out.
I love that he can climb in and out of it on his own. He had trouble doing that with the Maxi Cosi. He turns 3 next month and we still use it almost every day. It's been a great stroller!