The base of the bagged super soil is much higher quality than any sunshine or promix I have mixed with in the past. I would recommend roots organic as the lowest possible quality soil to base upon it.
Why I butted in here: A few weeks ago I went over to Everwood Farm (I live close by so bug them regularly) to do a micro nute soil and leaf test to see if I was in balance... whatever, everyone was huddled over a table containing several piles of potting/super soils. I don't mean to be mysterious, but if you take a bag of TGE and a bag of DTE Pro Organic mix and put it under any magnification you want, it is fairly obvous... Not exactly the same macro nutes, but identical in the myco and benificial bacteria, ... whatever, its all good when it gets to this level.
This is todays winter indoor, day before harvest photo.
Used Everwood Farm PrimoEarth mix (you have to call and ask for it, not on their web site). This is my fourth run with Romulus from seed, but first run with the new BOB biochar blend. Perfect 16 with the tightest buds ever.
This is my test from last indoor run, same seeds:
used PrimoEarth mix, DTE PRO Organic, and some Flying Skull Z7 to help with my crappy water.
I am willing to wager this years test will break some barriers that only Hydro guys have reached with ugly chems. But this is all NOP organic, and you can't do that with anything but good soil.