One thing bad about rotary compressors is that they are made to run constantly. They are more for industry and don't cycle on and off like the piston compressors like what you would need for a home shop. And yes they are a thousand $ or so more than a good piston compressor. I sold compressors and shop equipment for 28 years and I know a little about them. A 5 horse 220volt 80 gallon 2 cylinder 2 stage cast iron unit is about all a home shop needs. Quincy sells them for about $1800.
