im a noob but i purchased the gh flora 3 part. i love it foe the fact that it has a different mixure scale for seedlings n cuttings, general mild, veg stage, transition, and flower bloom stage. i havent had a prob yet with a proper ph everything is swell but this is my first grow and im in my second mixure stage still but the transition went suprisingly awsome. like i said this my 1st grow so i dont know if any other brands give as much info.