What will be my granddaughter's 4th Woom (predictably, a Woom 4) is hanging in the garage awaiting Christmas. I've been nothing but impressed with each of the Woom bicycles we've gifted her, starting with the Woom 1 balance bike. They're very well built with decent components, but maybe most importantly, they are comparatively light weight. They are a bit pricey, but used ones, if not quite abundant, are out there.
As a bit of an aside, to my mind, weight is a critical attribute for a kids bike. Consider that a 30lb bike for a 160lb adult equals ~ 19% of their weight, while a 12lb bike equals 30% of a 40lb child's weight. A comparably heavy bike for that same adult would weigh in at 48lbs.
Steve in AVL