Works great for me. Also use compost teas every other feed. Also prices aren't that bad, at least not here in Europe. Never had problems with overfeeding, never pH, always mix direct in my tap and always mix fresh. I'm using grow, bloom, topmax and heaven and thats all I need. 1l bottle of grow or bloom is about $20, lasts me about a year. Heaven is expensive as fuck, but don't use much of it, only if I run in trouble ( every run at least once). Top max is about $30 for a 1l bottle but lasts me at least 2 years. The better the soil I start my plants in the less I use from bottles.