I just used it for the first time this past harvest after 4 years of growing. I followed the feed chart for the amount I mixed in water. I still have to wait for the cure to see if it has an impact or not. Since two of the 4 plants I harvested were from clones from a previous grow.
My two cents is to hold off for a while until you get a few grows under your belt before adding in things that may only have a small impact on the finished product. Not saying that Winter Frost doesn’t work, but I believe having a good base that covers all your macro and micro nutrients, and good genetics are better than throwing more money at extras.