I'm well aware of the fine-print from SBEPros.. they probably have that to cover themselves from those customers that are not diligent enough to check and verify that the buckles work reliably... and as a parent, I am making sure the buckles are working well enough when my kids use them.
The only issue I've had with the extenders is that the price was ridiculous
The only issue I've had with the extenders is that the price was ridiculous