i have a kaiser rotary screw inside my cabinet shop. quiet and reliable. cost a boatload of money but would never go back to a piston style again . i run several pieces of big equipment off of it. a morbidelli 636 nested based router, scm olympic 2000 edgebander,scm sigma 90 beam saw and other small cam insertion machines.It never comes close to putting a strain on it.As for cycling on and off ,they do , but they dont shut off between cycles like a piston they stay running and are either on load (making air pressure) or on idle.