I'm a beginner when it comes to shaving with straight razors, and decent shaving supplies, so I need help from this community. I might say some stupid stuff, as I'm pretty ignorant on this topic, so sorry in advance!

So I want to know if there is something wrong with buying a vintage $65 or $100 kamisori, as opposed to the new one's which cost $150-$200. Are the vintage one's considerably worse than the new pricey one's? Are they on the same level and the only reason the vintage one's don't cost $150-$200 is because they've been used?

I want a REALLY damn good shave, as I want to restart my beard growth with beard oil, a healthy lifestyle and just for the sake of regrowth. So are vintage straight razors just as good as brand new straight razors? Or are they worse? What should I look for in terms of pricing and quality?

Also the vintage one's say "Shave Ready", are they usually sharp enough for a really good shave with only stropping needed? Or do I need to do a bit more to it when I receive it in order to get a good shave?

Thanks for the help!