I bought a refurbished Brother PC6500 combo machine from Ken's 3 years ago. I have not had 1 bit of trouble that was not operator error and nothing I had to call them to see about fixing.
I'd buy another machine from him if I had any money. I want a lightweight computerized machine to tote around.
If it is a machine from Ken's you'll be fine. They check them before they send them, as far as I know.