It's not going to be anything like an F80. For starters F80 is 3/8" drive, s710 is 1/2" drive.
It's an old ratchet. It will will work and Is dependable. It has 36 teeth. It won't be an 80 tooth ratchet ever. If it's < $20 it's worth it.
you would surely see a difference in using better steel. Bed frames, although cheap, **** for welding projects. Don't get me wrong, I've used it before. Some is better than others but for a project you actually want to be attractive get some real material to work with.
Oh, you got a message from someone else? Not eBay? Screw that...they can't do anything. You're not a dealer so you don't have to follow MAP pricing. What are they going to do, pull your distributor license you don't have? Lol