I have a home made (sort of) 5 HP briggs compressor. I bought it from a friend in 1988. He was a contractor and had a 20 gallon 2 HP electric compressor he used.
The electric motor went out and he had a new 5 HP briggs...hmmm...why not?
He swapped the engine on and used a pop-off valve. It works quite well, but cost him too much (even back then) to run all the time. Plus when the valve pops...it is horribly noisy.
I use it in salvage yards and outside around the house. My neighbor roofed his house with it. Dad and I painted his neighbors house with it. We even spot painted a few cars with it. It is very convenient for that sort of thing, but not good for a shop.
I love having it around even with the larger electric compressor we have now. It is handy for a lot of things.