Glad you are ok. One of my basic rules is never to trust my life to a HF product. I'll never get under anything being hoisted or supported by one. That's despite generally hearing surprisingly good things about jacks, etc. But Jack stands are relatively cheap, so that's not a place to skimp. I'm fortunate not to use them anymore thanks to having a lift, but long ago even right out of college, I got a pair of nice Craftsman Professional jack stands rated for more than double my car's weight.
For the record, I think HF is fantastic for some products. And in some respects, steel is steel, but the moment your life depends on engagement, tolerances, fit, etc., that's when I say no.
I may sound like a hypocrite because
I do own one of these but that is merely meant to prevent a vehicle from tilting, taking relatively small amounts of load. And for it to fail, a bunch of bolts would have to shear off or a bunch of large threads would have to shear.