They're ok, I mostly used these because I had some left over from my DWC days. I'm not really sure how much they Improved my grow or if they even did since the soil was already tailored for growing cannabis.
I had most of this left over from when I grew in deep water culture. I like the pH Perfect, however I think it works better in hydro versus soil, but that is what its intended use is - so I can't really complain.