Some (though not too many) gals will use the white list as part of their screening process.

Of course it means that you give up your TER anonynimity in so doing.

whitelists certainly help with the screening process, but be prepared to provide a additional info as TER is not sufficient on its own for many ladies..With that said, its better to be with it than without (especially if it shows that you have great relationships with reputable, established companions).

Not all providers are able to whitelist

When I first started I was unable to whitelist a client.  I had to contact TER and get approved to be able to whitelist my clients.  I've spoken with several providers who don't know this, don't know how to whitelist, and therefore just don't bother with it.  So, if your provider says she doesn't know how to do it, you might tell her this.

I also request that a review be written first.  Then I contact the reviewer and if I don't already know who they are I ask them to tell me their name and phone number so I can confirm that I saw them before I whitelist them to be certain they are okay before I do this.