This is pretty much my experience with her as well. She's sweet, she's hot, and her humjob would be the envy of any pornstar. She boldly goes where most don't have the physiology to follow. My experiences with her have been excellent.
I get, that the chemistry isn't always there with a provider, and everyone has a bad day. But she's gotten a lot of positive reviews here and elsewhere. I'm not sure dive bombing the thread with an unexplained "YMMV" represents bringing any light to the review, and the OP gave a pretty straight-up rendition that closely matches my own experiences with Nikki.
So sorry cm47. I appreciate a timely heads up as much as the next guy, but with respect to your comment, all I can say is "YMMV".