I am using it. I have found with my current group of flowers, I need to keep the ppm's between 500-600. I am at day 59. Most of my plants stated flowering around day 25-30
I am using 3 grams of MC along with 1.5 grams of BE with 1 gallon of RO water, ph'ed to 6.5. This recipe usually results in a ppm of 560-580. Plants are adding trichs and swelling, so I am pleased. And good lord, the smell coming from the cabinet is killing my filter!
Good luck!