First of all, the price is expensive given that the sachet keeps its effectiveness for around 1 1/2 - 2 months (regardless of what the specifications say). So, if someone starts placing them in July, by the end of August - beginning of September they have to put in new ones again. I have used them for two years, with questionable results, as the olives had, to some extent, been infested by the olive fruit fly.

I give it three stars without this meaning that I rate it negatively. Since I cannot check it up close to see if it actually does its job. Anyway, it works in addition to the sprays.