The '75 "F" is a good year- has the better brakes and spoked wheels.
Only you can decided it the bike is 'worth it' to you.
But if it's cheap, and you want it, then buy it. If not, then someone else probably will.
Why do people ask other folks on the internet whether or not they should buy something? I understand they are probably just venting some of their excitement/enthusiasm, but still... If you really want our opinion, post pics, the price and give us some more information.
Even then all that anyone here could say is whether or not it is reasonably priced. No one here can tell you whether or not you should purchase a motorcycle. You're better off asking your wife or your mother that question.
with love,
Fang