the cipher is cool, it is one of the only ways of advancing the stock timing 2 degrees. it also can adjust the idle speed... past those 2 things it's a nice monitoring & logging software, but really there is better obdII data interfaces available for less than half the price of the cipher, your paying hundreds more just to do a +2 bump & have access to a few other nissan specific things that aren't useful for performance but cool to have anyway...
I'm not saying it's bad or not worth it, just weigh all your options before spending $400+ on it, for example you could buy a utec turboXS piggyback unit that can really do way more, forget +2 across the board, you can build your own ign maps, your own fuel maps, it also does data logging & alot more, but you either have to find someone to tune it or learn how to use it yourself. that does way more but costs over $800...