I'm noticing that in forums and such FF is sometimes getting the label as being for noobs. I don't completely understand it myself, and I've used it most of the time during my 3 years of indoor growing.
Now I'm sure stuff like Subs Supersoil is amazing stuff but its not feasible for me to aquire a shopping list of ingredients and cook it in the sun for 3 weeks and end up with 4 garbage cans of medium.
I'm just a little indoor grower, and I prefer to use something right out of the bag with a cut of perlite in it and FF achieves what I want to do.
I've tried the nutrient line as far as the trio pack but honestly I think Dyna-Gro works just as well if not better.
I have to keep it as simple as possible or it wouldnt be any fun for me. I would like to try Pro-Mix sometime but there again, I don't need a bale of the stuff.
Oh, and BTW, I used to buy it at a Hydro store and paid too much for it until I found a little landscaping shop that lets it go for $ 16.00 a bag and it works for me.
I also once switched to Roots707 at the suggestion of a guy at the grow store and I didnt like the results at all. My growth was a lighter green all the way through and switching back to FF ended that problem.
Lastly, it beats the living hell out of Miracle Gro