I use this and have great success, sometimes I have to adjust my formula for smaller plant or plants that are more sensitive to nutrient.
Usually do 1/2 formula for seedlings and picky plants. 321 for normal growth un until 2-3 weeks into flower then again depending on the plant I'll go up to 4, 2.66, 1.66 plus 2g of Jack's pk boost
This is way cheaper and seems to work just as good as flora trio