I have used feminised seeds with almost all my latest grows, and i suffered from hermies for the first grow as i had no extraction system. Though now i have a completely controlled setup im not worried about hermies.
The only reason i now use feminised is so that i can grow several strains together without having to grow double the plants to sex them. I now have 4 strains growing [8 plants ,2 of each strain] and have only had to germinate the 8 seeds i used.
Like xcrispi says above don't bother with feminized unless ur sure u wont stress them, but given the correct conditions they can save u space in ur growroom.