So far I can not say anything negative against the winner Stiftung Warentest 7/2008. Most around me have the Puky learner bike. But the price is much cheaper Kettler and has as much to offer in my opinion. Our daughter has certainly enjoy it. She got the runner to 2nd birthday. She is still a little small for the impeller, but not much is missing. A brake you do not need at that age anyway, because the child is not yet able to. I can only recommend the Kettler as very good value for money.