i use the 3.8 cu.ft. bales of growing mix. i have used promix, sunshine mix, fafards growing mix and others. i have had bales that were bone dry, wet, and partially frozen and very good results from all of them. i use about 6 bales a year at 49 bucks a bale. i am a little jealous that others are paying much less, but for now my option is 49 a bale and i pay it.
i used fox farms line up and start with just the big bloom at around the start of week 3. i also use MagiCal which has really helped with the fox farm nutes.
i did have a couple of young plants with some minor rust spots, but it has not progressed any further since adding a small amout of MagiCal about 2 weeks ago.