I have used it in the form of "old formula" MD6 (they changed the formula after sales of PPA, aka norephedrine, were restricted by the FDA) and still have one bottle of this left.
I have enjoyed using it - effects similar to ECA but with less jitters, less sleep problems, and less harsh on the prostate. However the "ECA dick" and prostate irritation are still present to some extent and as a result I will severely restrict my use of these types of products in the future (I'm 35).
I am much less jazzed up in the gym when using NYC than with ECA. In fact if anything it leaves me slightly tired in some ways if wired in other ways.