Feminized seeds are a marketing ploy to rob you of your hard earned dollars.
From a good friend of mine
Folks will disagree with me, but I don't feel there is anything stable at all with FEM seeds.
At best, you get a breeder that knows what he/she is doing. By that, I mean you have a breeder who has a special female that has been watched and studied for a long time to know that it is stable. By stable, I mean it doesn't have a tendency to produce male flowers under environmental stresses. This forced female (by using colchicine) will produce "XX" and "XY" pollen resulting in progeny that are "XXX" and "XXY". This is the most ideal, and honestly, both are hermi. This is fine though if all you care about is that generation. In other words if you are just going to grow these seeds out, harvest, and then not try to clone or continue the line then you are fine. To me, this is the only real functional application of feminized seeds. For the most part, you will have a 99% female crop with maybe a few hidden nanners on some of those "XXY" females.
At worst, you get a breeder that just wants to make money. They find a dank cut but don't check to see if it is stable before applying the cholcicine. Or, or, or, they look for a fairly dank female that puts out a male nanner or two in flower anyway (without cholcicine). Either way, you are going to get nutty pollen that could be "XX", "XY", "XXY", "XYY". When I hear horror stories about folks having big time hermi problems with fem seeds, it tells me a lot about the breeder they got them from. These seeds are highly unstable and are a waste of the grower's time.
If you plan on cloning and keeping a female alive, then don't waste your time on fem seeds unless you just absolutely have to have a certain female. I'll never waste my time with fem seeds. I would rather spend my time selecting from males and females and finding that one super female to keep. Of course, my setup is condusive to that. As I said, some folks need feminized seeds based on how their grow is set up. So if you can only grow from seed and you can't keep clones, then "Stable" or rather "Reliable" feminized seeds may be an option. Personally I would rather buy double the regular seeds and just cut out the males. This is typically cheaper as feminized seeds are usually more than double the price of regular seeds.
And please, for the love of the plant, if you are planning to breed, DO NOT used a feminized female. Remember, your most ideal case is that she is "XXX". Still a hermi, and the progeny from her crossed with a stable male will be "XXX" and "XXY". HERMI HERMI HERMI. Hermaphrodites are one step closer to our favorite plant turning to hemp. A self pollinating sea of low THC, low yielding plants.
Anyway, rant over.