On the sellers side, considering all the work and many hours that went into one (I know, I fully went through and cleaned every single part in mine), plus a nice 3 jaw, accessories, full change gear set and various tooling, stand, motor, $750 is not too bad, but it also looks like he cleaned the ways with possibly a random orbital sander. On mine, it has ripples from machining. They ALL have ripples, but his. And cleaning them up with a power sander (who ants to do it by hand?) can hurt accuracy.
On your side, the only thing I see could be wrong is worn ways, leadscrew/halfnut, gears, and two bearings. If you have the money, go for it. If it turns as good as it looks (presuming seller tweaked it for it's best) it's still not worth it.
Now, as I said I tool every screw, pin, bushing out, cleaned it, and reassembled it with the proper lubrication. That was easily 30 hours of work that went into it and my hands were stained from that grime for a week.
My lathe runs okay, it's not the best. Backgears are loud, halfnuts wear fast, and it can be one frustrating machine at times. But I got it cheap, and it was a great learning experience. Plus I have a lathe now.
If you can find a better deal, don't get this one. Bus if you absolutely must and have the money, go for it. But try to haggle him down to $500.