Robustness, speed changing you can count on. Braking is robust and do not give. Excellent construction

Chain keeps getting off. Had a tightening rod installed pulling the back derailleur so the chain would not come off. Resolved the issue.

Highly recommend the bike. it is a serious toy for kids and had me relaxed knowing my son was safely equipped. I must admit I had to fight for "selling" the color, since kids goes by that criteria long before any of the stuff mentioned above.