i've heard good things about the dm reverse and it works pretty well for doing what it claims..
as for hermies and fem seeds, i've grown idk, atleast 10 different fems from as many different breeders, and i've never run into any hermie issues.. but i do try and stay away from some of the co's that are known to have hermie issues with their fem seeds like for instance greenhouse seed company.. i'd never grow a regular bean from ghsc, let alone a fem'ed.. but i think so long as you do your homework and stick with the more reputable breeders who have the fem thing down, you'll have no problems with fems going hermie on you..
i've used these breeders fems with good luck..
dna
reserva prevada
sagarmatha
dr greenthumbs
g13 labs believe it or not..
sannies
dutch passion
and a few others that i'm forgetting about.. but i feel comfortable saying if you used any of these breeders, and don't do anything that you wouldn't do to a regular seed, you shouldn't have any hermie issues with them at all..