Ok, so I got the heater on Friday and on Saturday installed the breaker and wiring for it in the garage. I have a surface mount breaker box in the garage so the wiring was quite simple. The plug on the heater is the one typically used for a 20amp 240volt device so make sure you get the right outlet.
It was only in the 20's here on Saturday. My garage is about 500 square feet with 9 foot ceilings. As others have stated, the air that comes out is not real hot. I used my remote temperature gauge on it and it showed a steady 220 degrees of warm air coming out. The the metal box itself barely gets warm so no fear of burning yourself on it. I could even put my hand on the grill with out fear of getting burned. The fan pushes a lot of air and is about as loud as a table fan. The air felt about the same as what comes out of a floor vent in your house, but with more volume. I used my portable propane heater along with the electric heater to bring the garage temperature up to 55 degrees, which was comfortable. Took about 30 minutes. Once there I found the thermostat on the heater to be quite good at maintaining the temperature. It would cycle on and off about every 15 minutes. For $120 I am quite happy with the heater as I can now work out in my garage in the winter!