I'm useing it and my grow seemed to be doing OK. My friends are using it too. The popularity of there products leads me to believe that there a good product.but I think almost anything works great as long as you get the dosage right. Next go around I'm gonna create my own homade brew. There's a lot out there on the subject its all N-P-K and various sundries. And prolly amounts to paying different prices for brand names. Study your ingredients and its just fertilizer. There more than one way to skin a cat.