I have used Neemos silver and found it very effective as preventive measure for leaf miner on bitter gaurd.I am also using other products of Utkarsh agrochem and will share experience about them soon.
I used huminoz product. I found it good. It dissolved completely in water whereas other similar products do leave a lot of residue. The product was effective too. I applied it to black gram, and found that it increased flowering and fruit set. I will continue using the product.