hi! we had a "learner bike" or "laufrad" for our 3 year old and it was GREAT! i really cannot say enough about it! he started just kind of walking while sitting on the seat and within a month he was kind of running and coasting for great distances. he would go faster than i could walk! it was great to teach him balance and he learned how to ride a pedal bike (without training wheels) in 1 week...so, i highly recommend them! the scoot is a good brand in the US (we used the puky from germany) because it adjusts to fit so many different heights...and, it doesn't have a handlebar that the child might run into if falling. the most important thing to remember is to get one that fits your son...
if you want more info, let me know!
-B.