to be quite honest...when i did use them, i found
big bud to be nothing special, infact i think it should have been mixed directly with the bloom base nute, i see no reason its separate other than to have another product to sell...
overdrive on the other hand did make a big difference...almost like when the flowers were done, they had another growth splurt, fattened up big, and foxtailed like crazy..
but when it comes to weight....i have seen no difference from using these, or a cheap COMPLETE fert thats all in one(usually a powder) and then as a bloom booster i use some 0-52-31 or something like that...i keep it simple...and cost effective