I was at least one of the other persons that mentioned using a spray painter with a "small" 11 gal. direct drive not medium sized compressor. The wait was approximately 15-20 seconds. If you want the larger compressor and have no wait time that is OK. I have personally had the larger 80 gallon compressor and a 25 and currently have a 20 and also have a 3 gal. For most doing recreational wood working this is more than enough especially for the occasionally spray painting. I use the 3 gal compressor for on the job fence jobs and leave the portable 20 gal unit in place, it is still to big to be hauling to another location IMHO. The 80 gallon unit was an Albatross in the shop. For a wood working shop it was rarely used any where near capacity. I was glad to get rid if it. You bring up good points but when buying I think you will waste a lot of money if you buy the biggest you can afford. Personally I can easily afford a $10,000 compressor. I personally have probably gone over board on machine purchases but that was my choice. I have gone over board on compressors also and prefer the smaller quieter units for woodworking.