They do a side by side at the local (Eugene,Or.) hydro shop, using FFOF and Roots Organic soil. I see a slight difference with the RO , but I am inclined to think they are dosing there RO being it is made here in Eugene,Or.
Happy frog is not for growing anything but seedlings. If you ever see a FFOF do pick up a bag and try it for yourself.
I have been using FFOF for seedlings/clones and all for 3 years now, and for 3 years my hydro guy has been busting my balls to try RO. So I finally did and I did a honest side by side. My findings where much worse than I thought for RO. I really thought I might be wrong and to find out, no I was right by staying with FFOF, but the RO was as good as dirt compared to FFOF.
When I bring buds in for my hydro guy, he always trips when I tell him I use only FF line up.