I've been using the full Fox Farm line up for quite a while with a particularly good Power Kush phenotype that I cloned the shit out of. I just recently added the 3 new products (microbe brew, kangaroots, and sledge hammer) to my arsenal. I just switched to 12/12 with the first grow using these new products per the FF feeding schedule and am going to be very interested to see if there are any measureable gains when they are done. ALL of my plants trace their lineage to a single Dinafem Power Kush plant I grew from seed about 1.5 years ago, and they are very consistent. Due to this, I know beforehand what each plant will weigh, within a few grams, after harvest/curing --- so it will be very easy to determine if these new additions to the FF line-up increase yields or not (at least in my particular situation). So far, my latest cycle has responded positively to the new additives, and my plants look the healthiest they ever have at this point in their lives, so I am cautiously optimistic. I'll know for sure in about 8 more weeks. Good or bad, I'll post on the forums what my results are and whether these appear to be a worthwhile addition to the standard FF feeding regimine.