I use it in place of the regular promix it works fine. The only major difference is they don't use the inorganic wetting agent (which is basically soap) in the organic mix.
LC's mix is great btw, the recipe I posted a couple weeks back is just that. It basically traces back to the 1930's or so from Oregon(been modified over the years), people been using it for years with great results. If you do this mix you MUST add the dolomite lime though, it is very important.