I've had nothing but terrific experiences so far. I self established some rules (not for everyone, but I'm a bit reserved/nervous and much more interested in slow, sensual times. Talking with a sexy lady alone is very hot in my book and I know I'm in the minority that way).
1.) I've only seen a couple ladies and restrict to those who have a solid history of high reviews for several years. (Safe bets).
2.) I don't look to see anyone who offers 30 minute sessions. (I'm looking for more connection and people who offer 30 minute sessions aren't likely making connections-30 minutes is probably more transaction based).
3.) I don't look to see anyone who charges less than$300/hour (maybe $250 but only if there are a ton of excellent reviews). I charge clients $150-$175/hour for my work and this is worth definitely twice or more what I'm worth an hour-I want her to have that sense of self worth and importance-I view it as I'm lucky to be considered a client not the other way around.
4.) I don't make last minute appointments. Sometimes I book a week or more ahead (big head thinking).
5.) No backpage-ever.
6.) Most women are attractive in my book, so I'm less worried about hair or bra size or whatnot. So I'm reading ads and "about me" descriptions looking for interesting people I'd want to spent time with. Never pick someone just because she's smoking hot if her ad is a jumbled mess or she loves Twilight Vampires and you are of the mindset that the only good vampires are Anne Rice vampires and she's thinking "who's Anne Rice?".
7.) You can read a lot about the guys who have multiple reviews what they are into and if it matches what you are seeking and then you can go look where they've been and see who they rated highly.
I think these narrow the field to established folks who are professional and offer a more connected experience. But that's just me