I have been offered this lens for $400 what do you think guys do i go for it or not?

Canon 70-200mm f4 L lens

Has small fault where focusing sometimes sticks at the 2 metre mark. It can be freed by turning the focus ring. If the focus limiting switch is set to the 3 metre to infinity setting the fault does not cause a problem. Otherwise the lens works perfectly, giving very sharp, high quality pictures.
Comes with lens hood, caps and case.