Pretty positive ours is the Maxi Rider too...goes from 14kg to 26/28kg as in WA all children up to the age of 7 need to be in a child restraint (not just a booster). We did a lot of research becuase DD is very tall for her age and the Maxi Rider is the tallest/longest seat on the market. She loves it compared to her "baby" seat, she's much more comfy while still being strapped in.

You do have to buy the harness seperately though, they don't come with one.