Are cheap Amazon jack stands safe to use?

Verified-purchase reviewers report years of trouble-free use from budget options like the Amazon Basics and Torin Big Red lines, but r/MechanicAdvice and r/Tools threads also surface horror stories with thinner welds and sketchy ratchet bars on no-name imports. Inspect the welds out of the box, always use them on flat concrete, chock the wheels, and leave the floor jack in place as a backup.