You mean your son riding park broke a kids board not meant for park? Nice. Why not get him a board meant for park riding like a Custom smalls.
I'd like to see the email you sent about the warranty. Typically an experience like that is preceded by an angry email blaming the brand for a shitty product. Which is not how to get stuff warrantied.
I think its actually kind of funny your basing your experience on a brand based on their kids equipment and one ratchet. Kids stuff isn't meant to take the abuse of the park to be honest. How many kids riding 121's are riding hard enough to break stuff, or even riding park at all? Very few. So why would they spend the extra money to beef up a board way past its needs?
Enjoy Union. I know I don't.
I do have to agree with Nivek. I've also had really good experiences with Burton Warranty and I wonder if your "problems" were you ranting to them. Kid gear is by nature cheaper and flimsier.