Ive used ff and mgo, still am using mgo and cant tell the difference in the growth of the plants. I can say I wasnt impressed with the ff which is why i switched it up, plants took forever to grow and looked crazy deformed. When I first started growing I grew with the cheapest soil I found hyponex mixed with black cow manure and worm casting, that was the best soil I have ever used. But for where Im at now with my hobby mgo is good enough for what Im doing. After this bag is done which could be a year cuz I grow in tiny cups or pots I will switch to coco which is what I wanted to use from the very beginning damn near two years ago. Anyways good luck to all the mgo growers, by the way im even using their blood meal and bone meal too got a great sale on it at walmart. Gotto love bargain shopping got them for $2 a bag on clearance. By the way my plants are over two feet tall and look hella beautiful.