We have the Britax Isofix Duo and the seat is fine, safely fitted, but agree the recline is not great, but DS always seems to sleep in it. The other one is quite pricey if I remember, and perhaps the rotation thing is a bit of a gimmick - would have to see it in real life.
Isofix is very simple to install and remove seat if needed, no need to regularly check it is fitted ok, and can be used in another car with the seat belt.