A few keep their mouth shut (I'm one of them), others read the half-fake reviews on RM (it never ceases to amaze me that every friggin review of a MP on that site is about one broad), or word of mouth through PM. Chicago is sometimes referred to as the place where RA from AMPs die. The quality in that town is lacking. Head to NYC, southern/northern CA, south FL, or metropolitan NYC, and you'll go nuts with the variety and beauty of some of these chicks.
I have 2-3 I see on a semi-regular basis. Most, if not all of them text me every 3-4 weeks if they haven't seen me. That has nothing to do with me being a hunk (I'm NOT). but a decent tipper, freshly showered and clean when I see them, and no surprises on the tip (none of them ask anymore--they know what I want and what I'm willing to pay). Oh yeah, I look at the reviews when and where ever I find them. But I've more lately just go to a place with no appointment during non-busy days (never had a problem as a walk-in on a Sunday between 10AM-12PM) and see who they have. If it looks promising I stay. If not, I book,
And if all else fails, I text one of my favs to see them.