I use the cheap crap but double up on the number of stands.
I remember once dropping a 911 engine as a teenager. I was under it.
The whole car dropped right at me and got caught by the second set of stands.
"Best not to think about it...nothing to see here..." and I went on with my work.
I've had incontinence issues since.
In that case, the stands didn't not work, if I remember correctly, it was my balancing act of the engine/tranny on the first set of stands. I don't really remember, just the whole car dropped about a foot right at my face.