I just finished installing this unit in my 200sqft shed. To be fair it dose have a high ceiling or no ceiling if you want to be technical. It also has no insulation and it is 95% here in Florida. The shed is 10' x 20' when I walk into the shed the AC is straight across the room from me. I can feel the air blowing but it is not very cool. 
If I step five 5 more into the shed, I can feel cooler air and if I stand right in front of the unit I can feel cold air. If I move to the right or to the left, even with the vents turned in that direction, I can not feel any air at all. 
This units focus on efficiency and low noise levels made it completely miss the mark on cooling ability.