Wouter:
From the early 2000’s I have helped testing Mycorrhiza, Trichoderma and beneficial bacteria’s. This was for University of Wageningen, The Netherlands.
From 2006 till 2010 I have tested different types from the company Humboldt and for BAC.
The results were in the beginning average. But after some years the results became super.
Especially when the right strains were found of myco and tricho. Not all strains of myco do symbiose with all plants. It took selection.
Yes I recommend using it. Do a small test, fungus vs non fungus. Experience yourself.
No matter what brand you use these days, they work. The R&D phase was +10 years ago, it already has been finetuned.
Stronger and healthier plants. You don’t need much and the fungus colonies grow by themselves and expand just like the plants grow.