Couldn't disagree more on Foxfarm. I use Pro-mix some too ( along with Foxfarm) but if Pro-Mix is all you use, then its going to need amended along the way, and amended carefully. For a noob, they're MUCH better off with Foxfarm straight out of the bag cut with some perlite and they wont have to worry about adding shit to it for the first 5-6 weeks.
I've grown shit that turned out dank as hell over and over with Foxfarm to say its shit.
Clearly it isn't.
There is also proof in writing that there are some people that work at Hydro stores that dont know shit apparently