My recommendation is to always make an appointment. That way you are mostly guaranteed not to have to wait on the lady of your choice. And, it's also been my experience in other cities that making an appointment pretty much assures that you will get your entire session time instead of it being cut short if the AMP gets busy while you are there.
As far as the Bait and Switch is concerned, well, there's really no way to know unless you are already familiar with the lady so you know exactly who you are getting. Or, you have a pretty accurate description before hand. Otherwise, ask for a lineup and go from there. But, generally, if you make an appointment, the correct lady will usually be waiting for you when you arrive. After all, an appointment is guaranteed money.
Personally, I overcome all this by getting you know the MMS'.
[QUOTE=ArtsLu32;7140427]This may be a dumb question, but I've never ventured to the AMPs. Do you guys usually call and make an appointment or just do a walk in? I was thinking of hitting up Soa 27 this week.[/QUOTE]