I'm with you, most of my grows are done with just CaMg A/B PK, but I do try stuff mainly out of curiosityTbh mate i have never tried any of those. (so i might get the same results from somthing cheaper than £35 a bottle uk)
I never used boost at all just a/b and calmag right to harvest.
I just seem to get healthy looking ladies right to harvest using it.
Not many times since i started with there boost (shogun) i get much yellowing
At first it tricked me and i left a few grows to long as they looked so good.
Im defo one of those if its not broken just try and make it easier type of men.
Big Bud is handy for a PK Fe & S boost