I tried their pro coco set in my coco solos one grow back. They worked, at least the plants did fine, but they did not, contrary to marketing, manage pH. I had to do more work keeping the res in specs than I do with normal nutes because the buffering in the stuff seemed to fight adjustment even though the pH was out of bounds. I would not use them again, I will be sticking with Jack's. Their buffering may work at EC's good for photos, but it did nothing useful in my grow at EC's I need to use for autos. I figured that a small trial would be worth doing, and was hoping that the extra expense of the stuff would be offset by less hassle with pH. What I got was decent nutes with more pH hassle, not less. At many time the cost of Jack's or MC. Not a complicated decision any more.