Is this the nusach of ha'Ari? I'm not too familiar with nusach Sefard/nusach ha'Ari. I like Koren's layout and aesthetics, and I've used their nusach Chakhmei Maroko (Avoteinu) siddur and love it. I've used both sefardi and azkenazi siddurim (family is moroccan and lithuanian) and am interested in the Ari's concept of a 13th gate for people like me, but I want to make sure I'm using his nusach. If the Koren edition isn't the Ari's nusach, is his available anywhere?
The Koren Sacks Siddur is Nusach Sepharad, that is to say, the "Spanish-Portuguese" rite. Nusach Sefard is a variant similar to Ari which bears more similarity to Edot HaMizrach and Ashkenaz to Sepharad. The main differentiating point between Sepharad and Sefard is in Kabbalat Shabbat; in Sepharad, Bameh Madlikin is said, whereas in Sefard, and by extension other kabbalistic nuschaot, Kigavnah and Razah D'shabbat are said. In summation, Koren does not have a Sefard or Ari siddur, the only company that I know of who does is Kehot.
By using both the Nusaj Sepharadic (Edot Hamizrach) and the Yair Emmanuel version from Koren, I can tell that the second (Y.E.) is a Sfard (Ashkenaz) and not an E''H)
There are plenty of other differences in the Nusaj, for example the way Bircat Hamazon is said and the order of the Harajaman
There are others such as the ending of the Shabbat service when the final Shir Ha-Kavod is sung (again, the Y.E. edition includes it where the Sepharadic one does not)