I have had good luck with them. I been using this one and havent had a fungus gnat since. Both work great if you ask me.Does anybody here have experiance with PotPoppers nematodes. The price is legit and comes with 8 doses can be broken down even further. Its under $20. It says it colonizes in 5-7 days. And can be stored for months with no refrigeration. I usually use ArbicoOrganics but they are twice the cost or more, have to be used within a week or two, and have to be refrigerated. I use nematodes mostly as a preventative measure, just want to know if its a waste and i should just go with arbico.