Does anyone have any experience using optic foliar switch ?

I started several this year from seeds I obtained last year. I had a few Hermi on me which was really a bummer. I didn’t catch them in time and they pollinated current batch. Does this stuff work to prevent Seeds and male flowers ? I have same strain that I want to flower in 3 weeks . I’m not sure what it is .. going forward I’m going to by feminized seeds now that it’s legal in NY finally! Any recommendations on seed banks ? I’ve looked into ILGM but unsure of other options.
I would greatly appreciate all of the input . thank you !!!

Fem seeds are convenient if you don't want to have any males to use for making seeds, but they are not inherently less likely to herm. Herming is a genetic predisposition. Some are more prone to it than others.

I've had luck with SanniesShop, SeedSupreme, Seedsman, and SunGrownGenetics.

Peace

Thank you !