interesting answers and a lot of aliases!

Since I've been back, as Jessica Knightly, I allow reviews (actually prefer them) yet, even with my rates at half what they used to be, I'm not nearly as busy.  It could be the current economy, it could be that I had developed a well known and respected persona BJK (before Jessica Knightly), or it is possible that the men that spend the big bucks prefer girls without reviews that still have a stellar reputation to join them.  Who know, but here I am, reviews and all.

I've seen two providers who asked that I not write a review (wanted to be low profile at that time). Both were great.

Noe

No difference in performance,  but I respect the "no review request" if asked. I understand why a provider wants to be UTR. However, if she seems to be hiding shitty performance ... then we're going to talk about it. IMO
 

or mentioned before or after. Maybe at the end the young lady may ask for one. And only on few ocassions, the young lady will ask me not to review prior to our date but that's only happened less then a couple of times. But they are rarely discussed.

There have been a few occasions where I agreed not to review and received a little "extra" in return. At the same I wouldn't hesitate to post a review if the services were poor regardless of their policy.  
I also prefer not to have any discussion about reviews with providers. I am never one to bring the subject up

one of them is still a regular.

They all were very good.

...then again, reviews almost never come up or are discussed in my experience.  I've only seen a few gals who had no review policies up front but they were all great.

This happended to me once before, and it did turn out to be one of my most mediocre dates in my two years of hobbying.
She had all great reviews too - which I now beleive represented her self-selection of reviews/reviewers (I guess she figured she wouldn't get a 10/10 from me, perhaps since she spent 20 minutes of our date trying to figure-out the volume on the TV so she could turn it up because she was paranoid that hotel staff could hear what we were doing! True story!).

So if a lady mentions this to me beforehand again, I'd really think long and hard about it, and be extra diligent in checking reviews and contacting other guys to get their more unvarnished opinions of her.

I had one lady tell me (after our session)  that I could do a review when I asked, but only if I ran it by her for approval first! Needless to say I didn't bother writing one. We had had a good but not incredible session.
As to the question asked, 1st, I often would not know in advance if she was a NRP lady, so that factor wouldn't enter into the see/don't see decision. 2nd, my experience has been that a lot of the NRP ladies do have reviews, esp the 20 they need to be ranked highly, and see no upside in risking messing up their numbers. In that respect, I think TER has changed it now so they do need some recent reviews to stay on "top 100" boards
One unusual experience I had was, i saw 3 of top 5 ladies in one major city one very fun extended business trip, but only reviewed one of them (my favorite that trip). Initially all had okayed me on another verification service, but then one of the unreviewed ladies pulled her okay when she saw I did NOT review her but did another. Such a silly game.

Those who want no reviews or opt out of TER reviews are not to be trusted.