If you buy a Rolleiflex, especially off of Craigslist, you should assume that it needs to be serviced. That camera will be anywhere from 40 to 80 years old and anything mechanical of that age should be serviced.
I'm not trying to be mean, but I am trying to help all of those who buy older cameras that this is a reality.
However, once serviced, that camera will run smoothly for the next quarter century or longer, depending on how you treat the camera.
The Rolleiflex TLR was used by all types of photographers - Sunday shooters, well-heeled amateurs, serious amateurs, wedding pros, studio work and newspapers. Some of them have lived and easy life. Many have seen a hard life.
Hey, Jerry, love that last paragraph. Good advice.