I first tried it out on a side wall of an alcove. I found the spray gun heavy, but I was able to cover the wall quickly and evenly. I was pleased with it, until I noticed that the spray had reached far behind the short alcove wall, and sprayed little dots of paint on everything behind it from the television in the left hand corner of the main wall to the doorway on the adjacent wall to the one I had intentionally sprayed, and everything in between, i.e. the window, a set of small tables, an easy chair and a lamp. Luckily, although time consuming, everything cleaned up fairly easily. I realized afterwards that I had the air level set too high. I reduced the air flow to do the back wall of the alcove, but it was a much slower process, and it was more difficult to distinguish between what I had painted and what I hadn't. I also had to keep stopping because the spray gun was too heavy. The machine is really only suitable for a man or a strong woman. The strap on the main part wasn't necessary. I think it would have been more useful fitted to the spray gun. I haven't rated it because, as a woman, I found it difficult to use, but I think a man would give it a high rating.