I use heavy 16. What do you want to know?I'm having great luck with it so far. Although it is expensive you don't have to use nearly so much. The bottles are concentrated so a little goes a long way. I started with veg a and b with prime. I just bought roots and I saw a noticable difference 24 hours after using it in my reservoir and as a foliar spray. I plan on buying the foliar spray next because I hear great things about it. Supposedly it does multiple things including pest control.
I run a Titan flow and grow system. Some things to take into account with heavy 16 that I've learned so far is you don't have to ph adjust if you're using Prime. Prime is a ph adjuster. I sent them an email asking about air in my reservoir and they replied saying they recommend a submergible pump to mix the reservoir. Air will fluctuate the pH. They said you can run air but to try and limit adjusting the ph a couple times a week before your weekly water change. I don't use air and have run into no problems so far.