Tons of members including myself have Yong heng compressors. Mine is at least 5yrs old. I've had to rebuild it a few times mostly if not entirely due to my own ignorance. But it still runs fine. Parts are cheap. Easy to work on. Just be aware of knock offs and look alikes. I would most likely buy from a seller with a lot of positive feedback on eBay. As for air cylinders.... yeah, I don't think I would trust those. Not to say they can't be. But let's say for instance the threads on the cylinder neck are slightly out of spec. Slightly can become a big issue at 4000psi. It's one thing for a compressor to fail. It's an entirely different thing for a pressure vessel to fail. I personally have a Scott 9L tank that used to be used by firemen