bio bizz gro

does anyone use or advise using bio bizz gro on the last 2 weeks of flowering?? ive been told its super for the bud and taste?
my grow shop man advised me to use it but doesnt sound right

He's basing his findings on a post from another board where a user and some other peeps have found that using it at the end increases bud growth. And since it's organic, you will not taste it. I used Bio and tried this, could not compare it to anything, and really did not see anything different. But the grower that posted this swears by it and so do others.
On a side note, some growers actually change the light schedule back to 18/6 for that last 2 weeks as they state it increases yield?? Never tried that one, but what the hay!