I have had only a single hermie in probably two dozen different feminized seeds. A lot of them from HSO due to giveaways and such. The Blue Dream from them is the only one that hermie'd, but in all honesty, I think that was more environmental stress than genetic as I grew only a single seed and only had one plant out of maybe 8 clones I grew out grow male flowers, and that particular plant for sure was subject to some stress as I had to tune my environment during some particularly cold winter weeks. I kept the seeds that came from it pollinating itself just to see what they would grow. Have one growing now. She does kind of look like "you've got a pretty mouth" weed for sure. Definitely different than the other plants around her, ha ha. I am just now getting ready to try my hand at regular seeds and hoping to find a male of a strain I like that I can begin hobby-breeding with for fun.
Anyway, my experience with fem seeds has been pretty solid. Grown seeds from G13, Barney's Farm, Dinafem, THSeeds, HSO, Delicious. No problems with any of them germinating or turning out to be females.