I've got an older JB 3.5 CFM pump that I've used for over 20 years. Never had a problem.
Although, when just out of high school I worked at a shop that had a pair of these silver vacuum pumps that looked like two pie pans welded front-to-front. A carry handle, a screw port to hook to your hose, and a 115v plug. No on/off switch, no disassemble to change oil. Those things ran forever. All beat up and dented, but, you plug it in, and they'd go. Old timers then. Wonder if they're still available anywhere?