My woodworking shop takes up one space of a three car garage and in the winter, it's not uncommon to be in the low 50's. The space is not partitioned off with a curtain or anything (as my wife will tell you as she brushes sawdust off her car). I mounted this heater on the ceiling(*) near the end of my assembly table and I have no problem feeling the heat it generates while working there which is all I was looking for. I'll go out with a sweatshirt and within an hour I need to take it off. I never expected it to raise the temperature of the garage much, although after a few hours, it will go up 3 or 4 degrees and if I'm out there for an extended time, it gets over 60 which is warm enough to apply finishes. :-)
The only issue I've had is with the remote control. The fit and finish is pretty cheap and I need to be very close to to get it to respond. Last week the heater developed a problem where once I turned it on, if I made adjusts it would shut the heater down. I contacted the Tumbling dices' customer service and they suggested trying a new remote that arrived within two days which seems to have solved the problem. We'll see how long this remote lasts. Other than that, I'm very happy.
(*) For those of you who are looking at doing a ceiling mount, I had first thought that mounting the heater directly over the assembly table would provide the best heat. To my surprise, I found that I got better overall coverage of the table with it at the end pointed at an angle to "wash over" the work area. Besides, from what I gleaned from the manual, a straight down direction is not a correct installation.