We bought this because it was rated safest at the time, having never used the ISOFIX in either of our cars.
Very light and easy to fit, although I had to struggle with one side of the isofix in my car because the clips were hidden under the seats.
DD has had a growth spurt so we've had to make the seat taller. That was quite straightforward and we didn't need to take the seat out of the car to do it.
My only gripe is that although we have it on as much of a recline as it will go, DD's head falls forward when she falls asleep, but that seems to be something that happens with all this style of seats.
She seems comfortable in it and the clasp that holds the belt across her shoulder works well