Welcome, Checkflag. I have my own preference in the CB's, it really depends on what you think. If you mean how does it fare in terms of performance, reliability, etc., my only thought is that parts are sometimes harder to find for F series bikes. This would only apply to parts, like seats and rear brakes, that are specific to the F.
If the bike is in good shape and running, I'd say that $1,300 is not a bad deal. Check the FAQ, I believe there is a checklist somewhere about things to look at when buying a bike. If nothing else, it may give you some ability to knock the price down some.
It seems we've had a bunch of F series owners join lately.