Heater showed up quickly in an undamaged box via UPS. I took it straight out of the box, filled it with one gallon of diesel fuel, connected a battery and hit go. It immediately fired and began to produce a surprisingly hot amount of air in a matter of 3-5 minutes. A little bit of smoke on startup as expected but once fully ignited you can't even smell the fumes out of the exhaust, a seemingly very clean and complete combustion. In about one half hour it raised the temperature in my 30'x50' uninsulated shop by a few degrees with one of the three roll-up doors open. I'm very satisfied with this heater and look forward to continued use in my shop and also trying it out at deer camp next year. The thermostat is a bit basic compared to others I've seen on Youtube but it works well enough. I might decide to change it out for one with more features later on down the road but we'll see how things progress as time goes by. Contrary to what I've seen online, it appears that the manufacturers are listening and mine came with better fuel supply tubing instead of the cheap green floppy garbage. The fuel pump also isn't that noticeable to me but I'm not picky when it comes to things making noise. I can't seem to hear it over the noise of the heater running on full blast.