It is a wonderful product and mixed w an aeration product such as perlite or other, makes for a great mix.
I add some micro nutrients I get to the mix, because I usually have my seedlings in communal pots that are about 4" deep. I keep them in these until the seedlings have 4-6 true leaves and for the added length of time in these pots, I like something in the soil. In most cases when I transplant out, their roots go right to the bottom.
Rick