question about Feminized seed

anyone have tried about feminized seed. Is 100% female. and which company is reliable. thanks

I've grown out LA Confidential (DNA), LA Woman (DNA), and Blue Mystic (Nirvana). The Nirvana had a 60% germination rate, the other two were 100%. No problems once sprouted, no herms, males, etc. I've heard Greenhouse seeds have herm problems, but DNA & Nirvana were solid quality girls for me.

ive had some herme issues and i think their unsuitable for breeding? right?