Just like our own Consumer Magazine, the results aren't given away for free. A recent change to the German tax rules means that Stiftung Warentest results can only be purchased by people inside Germany, using a German credit card. We recommend Which?
a UK consumer group, we find that the results are easier to purchase, because the website is in English, and obviously it helps that the report is in English too.
The results shouldn't be taken too literally, the best car seat for you is the one that fits in your car and fits your child, and the needs of your family.