femininzing does absolutely nothing to the dna of the plants, so if the plant was stable before it was sprayed with c.s., then the plant is also going to be stable after it's sprayed with it, ie, fem'ed seeds made from that plant.. if the plant was potent, or yielded well, than fem'ed seeds will also all have those same traits..
i'm not a big believer in thinking that everything i see in high times is gospel, but a few months ago, on their online site, they did a side by side grow of ak, fem vs regs.. was pretty cool test, side by side, same grow environment, same lights, same nutes, same everything pretty much..
maybe you could find it via google and check it out for yourself..