I love AN's lineup. I use the 3part, works fine. The overdrive is worth every penny! Be prepared to extend harvest by a week or two, and give it at least 2.5 weeks to do its thing. I dont know about the Bud Candy, lot of controversy on it. I also just got the Big Bud additive. I hope it does well. Ill see soon. My water has calcium, so none needed for me. As for your question, won't hurt a thing. Im sure a lot of these additives are very similar between companies. One quality product surely mixes with another. Me, I just pay for AN because they've always been decent to me and seems to work. If I was a huge operation, perhaps nutrient cost would be a much bigger factor. Let us know what you thought of the Overdrive and big bud, sounds like we growing similarly. You in an ebb and flow too? Happy growing!