IMO they're overpriced and I really don't like the fact that they don't disclose what's in there under guaranteed analysis. How can you correct a deficiency if you don't know what you're feeding your plants???
My friend did a run with them in ebb& flow about 8 months ago. Results were nothing special.
It's another company trying to sell another secret sauce and keep you in the dark about what's actually in their bottle.
just my .02