I worked for Hotsy for about 21 years. For a small time they made a heater like that and I owned one for about 5 years. Puts out an incredible amount of heat. Kind of noisy as the burner puts out a fairly good roaring sound. Also it definitely left a kerosene odor in the shop..... but it does...
I've got a Wayne Dalton.... It was on when I bought the house. So far... so good... very quiet and fast. Can't believe there aren't more choices along this line. Also has a 10 second delay button that lets you leave the garage before the door shuts. It doesn't use the photocell sensors so...
I have some new T5 fixtures with 6 52W 4 ft. lamps.
Incredibly bright and no perceptible flicker.... also work even when the garage is very cold.
They replaced some old T12's.