I think we need to get DS1 a scooter for this summer. He's bored with his balance bike and doesn't really get it. I started doing some research but most scooters usually are listed for age groups that are either from 2-4 or 5-8. I don't want to get him a scooter that he will outgrow in a few months but I'm concerned that if I get him a more advanced scooter, he'll get frustrated with it and not use it. Any recommendations on brands? Three wheels vs two?