DS got one for Christmas and he absolutely loves it. I had never seen them before and then DH did the fittings for a bike shop (he is a builder) and the owners gave him one to bring home to test on DS. They funnily enough said they are huge in Germany! We ended up getting ours from Aldi for $60 - only because DH discovered it was the same brand as the bike shop one but 1/3 the price (the other one was the "Wooden' brand - the Woody B model). It took DS a little bit to get the hang of it - but now he has his balance he is so good on it. Ours has an adjustable seat on it which has been really important (not sure if its a feature on all brands) because initally it was too tall for him and DH had to drill an extra hole in it. DS found it quite hard to balance until the height was correct. I am so glad we brought it and everywhere we go, people stop and ask about it.