As impposter already explained, if you have his TER handle (and make sure it IS him by requesting he PM you here) then you get to see all of what he's written in his reviews of others.    

Not only will that hopefully give you some sense of his likes/dislikes, it will also show you his tastes and preferences in providers.  If he mainly only sees one particular physical type, or age-range, that can be useful knowledge to have.
Likewise if he sees a variety of types, but tends to give lower scores for one type versus another.  

And of course, some ladies will refuse to see gentlemen who appear to be stingy-scorers.  That is, even if the words of their reviews are all complimentary and polite yet the scores are lower than each lady's average: that might be a pass.  

 
Also: you have the Provider Limited VIP which means you can look him up via his email address to see his Whitelists but this won't show you his reviews, if he's written any.  Having Full VIP, however, WILL show you his reviews via that search.  
Although this feature isn't a secret, not everyone knows about it so occasionally someone will be surprised when I mention something I found in his reviews, even though he never told me his handle here.  

... is that it allows you to, if you wish, perform "market research" on other providers by doing profile searches based on details visible only to full VIP members, such as rates, services offered, and review scores.

Thus, allowing you to know exactly how much of your life you've pissed away on this place.

How do you put a price on that

Also giving back to the site that helps all
Of us connect...