The build quality is really good, super quick and easy to put together (just popping the wheels on and the handle bars). Everything comes to put it together in the box, and the design is so much better than the smaller older bike he had. He no longer runs over his feet and leaning too far forward and falling over is no longer an issue. The boy loves rolling around in his new wheels. We are also far more confident letting him roll around on the uneven ground outside because it is so stable. The only downside (and this has nothing to do with the bike its self) was the deliery, DPD was used and they just outright refused to deliver the bike to us for some reason then took it to a depot for me to collect an hour ago even though the driver kept going to the depot in the next village along, they were bizzare the driver sent me a picture of a bush one day. Not Bergs fault at all, the bike is wicked, its DPD that suck.