Because Which? are slightly misguided, and instead of looking solely at the safety aspect of ERF seats they get marked down for things like alleged lack of legroom for the child and difficulty of fitting. My 3 year old is in a Which? Don't Buy seat, the Britax Multi Tech II (they have tested it as the Volvo Convertible). I will gladly keep her in my Don't Buy rear facing seat rather than put her in any of the forward facing Best Buy seats!
My seat is not hard to fit at all. I bought it from an independent retailer who spent about 1/2 an hour finding the best seat for my car and showed me how to fit it. It also comes with a very useful instruction booklet that tells you how to fit the seat
Granted there are more steps to fitting it than just plugging a forward facing seat into the ISOFIX connectors, but it's not hard or complicated at all.
This is what Which? have to say about the Britax Max Way rear facing seat
"This child car seat has passed the regulatory tests required by ECE R44/04 to be sold as suitable for children from 9-25kg. In our own more rigorous tests it achieved a good overall safety rating, but the seat is so difficult to install that there's a danger of installing it incorrectly which, along with other drawbacks, means that we've made it a Don't Buy.
The instructions and warning labels are easy to understand, but there's a good chance that you will install this seat incorrectly because it's so complicated to do. You need to get the seatbelt routing correct, make sure the floor and seat support legs are correctly positioned and also attach the tether to the front seat, so it's no surprise that this seat gets a poor rating for ease of fitting. It also takes up a huge amount of space.
Is the seat comfortable? No. It's narrow, with hard padding and an uncomfortable leg support. The seating position is not convenient and the child's view is limited."
And this is what Securatot (rear facing specialists) say about it
"The clever design includes quick recline with the adjustable front leg and an easily adjustable headrest and harness. Safe installation is ensured through the newly designed support leg, belt lock-offs and easy clip lower tethers. The Max-Way has also passed the rigorous Swedish Plus Test, the strictest car seat standard."
Additional features:
•Rear facing up to 25kg
•Height adjustable headrest and harness with easy single-handed adjustment
•Deep, softly padded side wings provide Optimum Side Impact Protection
•5 point safety harness with one pull adjustment
•Adjustable support leg allows the seat to fit a wide range of cars with adjustable recline
•Foot prop provides extra stability
•Fits well in centre back seat of cars
•Belt locking mechanism ensures correct installation
•Multi recline positions
•Height adjustable 5-point safety harness
•Chest pads for your child's comfort
•Harness retainers make it easy to place your child in and out of the seat
•Quick remove cover without interfering with the harness
•Installation with 3-point seat belt
•Installation with 2-point seat belt
I know who I would listen to!
This is a good blog post in answer to an article Which? wrote about rear facing child seats.