I figured they're probably all made in China, this one was cheap, so I'll try it. It's actually quite nice. It's smaller than I expected, which is good. I like the metal case. I see the over $900 otc one is plastic. It makes thick smoke. The fittings are nice. The flowmeter is nice.
Any of these is just a regulator, some means of controlling flow, and a heater. I don't know how anyone comes up with $900-1000 for that.
I regret buying real "smoke fluid" for it, it is obviously just mineral oil. The instructions for this even tell you to use that. No magic here, it just heats up oil to produce smoke. I'll use mineral oil, not baby oil, which just has a scent added. The smoke gets in whatever you're testing, condensing and coating things a little, so I suppose there is some minor risk of the perfume decomposition products being corrosive or something.
Speaking of instructions, you sure don't need them to operate this simple thing, but they are written (or translated) pretty well.
I might like to have a 120vac power option. I would rather not have the more expensive type that comes with an air pump. More moving parts means it's more likely to break. The 12v might mean they use a cheap diesel glow plug for heat, I don't know. Maybe I'll take a look inside.