Not read whole thread so I don't know if anyone has mentioned this already but this seat is a Which? best buy!
The Concord Lift Evo PT a Best Buy in 2006 and then again in the 2007 retest to our new, more stringent test, is comfortable, provides good leg support for the child, and it's easy to move from car to car something worth remembering if you're a two-car family.
This seat is a booster with backrest, designed for transporting children from 4 to 12 years (15 to 36 kg). It uses the 3-point adult seat belt to secure both the seat and the child.
It's light-weight, very easy to install, and it offers adequate front crash protection. Side crash protection is good, and is aided by the unusual side 'wings' on the seat, which extend downwards to provide extra protection for the child's abdomen.
It's also possible to adjust the seat's recline angle, which makes it more likely that you'll be able to get a good, snug fit whatever the rake of your rear seats.
The high back is good for taller children, but in some cars it touches the head restraints, which may need removing to allow the seat to sit flat against the car seat-back.
Pros: Easy to fit using the seat belt, easy size adjustment, very high backrest, light-weight for easy handling, machine washable cover
Cons: Finish quality slightly poorer than other models