I guess its a matter of opinion.
But its hardly snake oil.
I agree it comes at a cost, but it only needs to be applied once every two weeks, if it were snake oil they would say apply it every feeding.
For the record this is the only bottle in my garden...
I have always kept a some biobizz kicking around just incase it maybe needed, but I never use it.
Strange you never noticed a difference,
Do you grow organically???
Snake oil salesman don't usually give away free samples for risk of exposing themselves and they're fraudulent product before getting your hard earned money.
Miicrobial mass stands by they're product and from my experience I can see why...best thing to hit my garden in over a decade.
Advanced Nutrients has always been a snake oil money grab.
Your the first person I have seen who was not happy with Miicrobial mass.
I myself am a big fan.