Sorry DTP, I have to disagree with you because while for you personally they may not have worked, most companies have proven track records with their additives, just most customers have no idea how to use them which I agree with you on. For example, with any live culture solution from advanced nutrients or humboldt or GH (does not matter where it comes from), tap water will kill all organisms in the solution, in addition to damaging your roots. When testing nutrients, all companies use 0 ppm water (distilled or reverse osmosis water) and very few customers detoxify their water already.
Another reason most people do not see results is because if you have excess of one element, it may block out the absorption of another. Some people refer to this as nutrient lockout, but in most cases people do not realize this is happening and attribute nutrient lockout to an imbalance of pH.
When used properly, additives as simple as B-52 from advanced or humic acid products like diamond nectar from GH will do wonders to your garden, no matter what anyone says
peace out
), and you can put as many good nutrients in your system, but unless your roots have optimal exposure to oxygen, will not break down their food and not grow! For this reason, i recommend quality airstones and an airpump that diffuses the air so the roots uptake it faster 
