I bought this for my 3.5-year-old for Christmas, as he'd outgrown his 12" wheel bike, and he absolutely loves it. It's perfect for all styles of riding, but we especially love taking it on trails, obstacle courses, you name it. The geometry is solid and stable. The gearing lets him go faster, but he can still crank up hills. Once he got used to the brakes (he'd had a coaster previously), he was dropping in on steep creek crossings, zipping around berms. The chainring guard is a brilliant detail. Components are all good quality. Would like an easier tire upgrade option, but what comes on it are totally fine.
I was a little worried at first that it would be too big, but with the bonus short seat post, it fits him really well. He'll be riding it for at least two years.
What a great bike. Would recommend for anyone whose kid likes to ride on dirt as well as around the neighborhood.