I'm chuckling over this in light of the long thread about fake reviews.
Anyway, before TER there wasn't a way to verify a provider unless you knew someone who knew the provider, and that never happend. Remember, "pre TER" means, pretty much, pre-Internet. So in NYC, you bought a sleazy newspaper called Screw (famous in itself) and looked thru the classifieds and called a brothel. Real brothels provided some semblance of quality control; but there were loads of fly-by-night operations and really horrible places with women in really sad circumstances. And finding a good one was hit-or-miss.
But the good ones were very, very good. I recall brownstones in the 80s and 90s on E 48th Street and E 26 street that had drop-dead gorgeous college students or grads; they were fun, funny, bubbly and perky, some really really smart (one asked me about Derrida), and all sexually charged. Never had a problem and loads of great times. Very few milfs, however.
But unlike today, everything was totally anonymous. Boys and girls both had stage names; boys had codes at some places. Verification? Didn't exist. If you showed up and they didn't like how you looked, they didn't open the door. If you saw a provider you liked, you hoped she stayed there because you would never see her outside the brothel. Well, those were the rules...
Fun fact: Except in the high-end brothels, kissing of any kind was never on the menu before the rise of the Internet and independents. Once I found the brothel on E 48, I was hooked -- all the providers did DFK.
I'm sure that back then there were higher levels of brothels and independents -- if you traveled in circles with men that knew about Holly Golightly and her friends. But I never did.
I would say service in the high-end places was the same as service I've experienced with independents. I'd give them 9s and 10s.
A final note: While the top brothels ensured a consistently good experience, every once in a while I'd see a new ad and try out what looked like a fly-by-night. It was by far mostly misses, but when I hit, it was fantastic.