I've used
Promix for 30+ years and never really had any problems at all other than a scrape with bugs once or twice. I add about 20% compost/manure and about 2 tablespoons time release flowering nutes in a 5 gallon bucket. I get great results without worrying about overfeeding or overwatering. I use the
Promix HP or BX, but NOT the general purpose potting soil, which seems like most of the other fortified potting soils sold everywhere. The HP/BX has no nutrients, just a little buffering to keep Ph in good range. No lockouts, no Ph issues, no deficiencies or nute burns unless it is my own doing.
In my experience, a good grower can get a decent crop out of a bag of gravel, and I know a lot of knowledgeble growers on here who d it in many different mediums. Once you get your process dialed in, you will do well. I would probably try some of the other products out there, but I know that my system works great and I'm too stubborn and lazy to admit that there might be something better out there.. Yeah, pride plays a big role as well and I'm as guilty as anyone...