High back booster for long journeys

[MsFrosty]

Can anyone recommend a HBB that is well padded for long journeys?
Been looking at the graco nautilus but I'm not sure if I'd prefer an isofix

[littlecabbage]

Our 7 and 5 year olds have the Britax Advansafix - they haven't complained about not being comfy. They are isofix with a top tether.

[IWantMyHatBack]

Britax Kidfix. It's much nicer than the maxi cosi one we had, and it looks quite comfy. Easy to install too (and to use without isofix)