We had been worried another impeller but proved to be too large and, above all too heavy. Have therefore a smaller searched. My son got this Kettler wheel when he was 2years + 1month old (about 90cm tall) and he came at once so klar.Schon after a few days you could see how he took off his feet and he was rolling short distances. Now I need my son even less drag when we walk - driving the impeller makes it fun. Extras such as fender, rack, brake ... we do not miss - so there are fewer opportunities to push themselves or with the clothes hanging to bleiben.Das wheel without these parts, too easily and you can easily take time for a while. It came to me when buying especially important that my son can thus safely and move alone and keep balance exercises. (Watching - the operating range of the children is with impeller significantly larger and they are !! rapidly disappeared around the corner) A small bell but we have already cultivated for fun. He finds great, but must continue to operate yet. For durability, I can not say anything - we have only two months. Assembly I have managed as a woman with no problems. The saddle we had to do several times and fixed the stickers say goodbye already. But I think that's not bad, because otherwise the wheel looks afloat. My conclusion: A simple, small, lightweight, stable wheel that brings the joy of moving!