feminized seeds

I am just flowering my first grow with four plants and got a bunch of males! I was pissed so I ordered some feminized PPP seeds from Nirvana. I am in seek of anyone who has experimented with this particular strain, and as many opinions as possible on feminized seeds. Are they worth it? I have heard you get a lot of hermies which doesn't sound right since they are feiminized. The seeds were expensive so I hope someone gives me some hope. Thanks.