From what I've heard & read, you'll get feminized seeds that way, but if you have a non-stable breed, the seeds will be non-stable as well. And there is some argument over whether or not those seeds are of good quality or not. Lots of people use them, lots of people throw them away. Sorry I don't have any personal experience.

On the bright side, I read a log on a different forum for Liberty Haze or Vanilla Kush (sorry - can't remember which one it was, but I'm pretty sure it was a Barney's Farm seed) where one out of three hermied. Dude carefully pinched off the bananas so he didn't get seeds - he said the hermied product was the best out of the batch.