I do not know much about the Fronts, but someday I will have a large tank full of them. I want the really expensive ones though, so it may be a while. haha. So I wish that I had more info on them for you.
Right now I have F1 barred Midas, orange Midas, Devils and Trimac. Been trying to breed my Chancho but the male killed his female this past weekend so he is going into the male tank and I may move my male Isletas into the Chancho tank and see if I can get more of his line. His line has been a big hit amongst the Amph enthusiasts.
My Pleco tank is probably my most expensive tank when it comes to stock, those suckers are not cheap.