Maxi Cosi just released the latest 6 months to 8 years convertible booster.
In Australia, ISOFIX is only approved to 4 years old. Therefore, there is no ISOFIX available on the Titan Pro for the Australian model. Just incase you did some search and found some pictures of this model with the rigid isofix - these are overseas models only and they are not approved for use on Australia roads.
The Maxi Cosi Titan Pro is suitable from 6 months to 8 years of age. The child can be in the 6 point harness until approximately 4 years of age. Once the child reached the maximum height for the harness, just tuck the harness away and lift the headrest further up and use it as a booster with the adult seat belt until the age of 8 years old.
The recline feature on this seat is rather clever. As you recline the seat, the seat is slightly elevated. This gives a younger child most visibility outside the window.
Remember, the Titan Pro is harnessed to 4 years only. If you want to have a seat that is harnessed to 8 years old, consider the Maxi Cosi Luna Pro or Smart. However, the Maxi Cosi Titan Pro looks slimmer than the Luna and some children's prefer to use the adult seat belt on a booster which is an feature of the Titan Pro.