...on provider profiles. The point however isn't where you find them but what your research tells you about them.  

Does the lady you're interested in have reviews?
Does she have a lot of reviews?
Are her reviewers established with many reviews to their credit?
Do you have a VIP membership so you can see her TER profile and read the general and juicy details of her reviews? (Have you read them?)

If you can answer yes to these questions then you have the information you need in order to make an informed decision whether to see her or not.

Like I have said on this forum many times previously, you can find providers just about anywhere, but you have to do the research on them.  Research of is as important as screening is for the providers.

Specifically, I think myproviderguide.com is as legit as any of the many other sites where providers place ads and profiles.  You can find some bad providers there just as you can on other sites, good ones as well.

Good luck and LLAP,
Swim