These can be successful but not at all necessary.
The forum is full of success with 1 and 3 part nutrients.
GH trio and never over 1000ppm, rarely ever that high. It can be extremely easy to grow lots of dank bud and over priced gimmicks aren’t necessary for success my freind 
I max my lights out gram to watt regularly with 
in a sterile system with just the basics and good environmental controls with 0 wasted nutrients as I have no run-off. That’s success in my book 