All chemical nutrients are the same except for the ratio and amount of the differnent macro/micronutrients. Ions are Ions, so regardless of which product you use you end up with the same thing..nitrogen in the from of nitrate, ammonia, or urea...phosphorus in the form of phosphate ions, and potassium in potassium ions...its the levels and ratios of these that make chemical nutes different. I have used sensi 2 part, and I have found that there phosphorus and magnesium ratios are a little low...now I prefer using the lucas formula which is just the GH bloom and micro. As for AN other products, they all serve purposes, but they are also overpriced and not really necessary. Bud blood, big bud, and overdrive, are just PK boosters whcih you dont even need with the lucas formula. Fulvic acid is helpful, but I wouldnt pay 30 bucks for theirs. Hygrozyme works better than sensizym(and less expensive), and carboload you can just replace with molasses. Vodoo juice works good I hear, but at 100 bucks a bottle I doubt is worth the extra boost in root mass it gives you. Pirahna and tarantula are good products, but agian, arent necessary. Barricade is just extra silica, which you could buy for cheaper from pretty much any other brand, and I havent really had any experience with b52. I think that pretty much covers it all right.