I know one grower here who has used it successfully. But I also know of 3 more here as well who have had poor results using it. It has been various problems... Pollen sacks form with no pollen when they open, not working at all...etc.. From what I understand CS is much safer and cheaper to make than STS as buying the things necessary to make it will put you on a "watch list". Unless you have ways around it but, most don't. Your best bet would most likely be CS. I'm on the fence myself and still haven't tried to do it.