I'm normally very good about the reviews. When SER was still going, I'd post the good ones, in detail about what made them good. Or if I saw someone was looking at a bad one I'd simply say "I personally didn't enjoy it, and wouldn't reccommend it YMMV." But that's about it. There is only one person I used to mention by name as having a horrible experience with, because of the obscene amount they charged to lay there like a dead fish and not do anything to make it enjoyable for either of us. Later she tried to get me banned from the ladies because I told the truth in a review, and was backed up by other guys. It was also a personal insult to me, since I had tried to have a couples-relationship with her over the years, before she really started providing. I don't mention her name anymore though.

That said, the safest bet is to assume that every guy reviews, and every provider shares your info. If you're nice about things, then everything else takes care of itself.