I got a Harbor Freight acetylene torch kit a while ago and I used it once, then out it back in the black plastic case and put it away. Jump ahead a year, I needed to braze up some pipe so I got it out and started using it. Immediately I smelled acetylene. I shut everything down, got my handy dandy soapy water spray bottle and went looking for the leak. I expected a loose connector or something but it was the hoses. Both had pin hole leaks along their whole length.
I threw them in the trash and bought a Hobart set.
I still get a little shudder when I think of what would have happened if that caught on fire.