Is this a good soil?

I'm not sure about that one in particular, but I use the advanced #4, and it's pretty good soil.

More expensive than bales of pro-mix. But decent

If it's like promix you will have to start feeding from the beginning, but it's good. I have had very good results adding mycorrhizae to Foxfarm soil.

It's a nice "grow medium" for soilless grow styles that you add liquid nutrients to. Or a good base of peat moss with aeration and beneficial fungus to start with as you add stuff to build your own soil.

But no, it's not a Soil. You can't grow tweeds with that stuff alone.

THat is more of a soilless mix bro. It is not fertilized you will need to add fertilizer either into the mix itself via dry amendment or w/e or feed bottled.