I have promoted construction projects of the stand that was featured in the AMA Model aviation magazine back some 7 years ago at two flying fields and they are still in use today. I've been to a half dozen fields in recent years and all of them had the safety stands. I have one at my home that I keep in the garage for when I want to run an engine on a plane.

To me, approval is utilization. They are at all the fields and they are used. That's good enough for me.