For an in depth evaluation of this soil mix and a few others, go to "Mandala Seeds" website and click on their "grow guides" where you will find a wealth of imformation about soil and soil growing, as well as many, many more tips and tricks about growing in general.
The information is well researched by professional growers and is well worth a look.
They have information concerning both European and American brands of soil.
Hope this helps, Organoman.