The forward drive is made PURELY to compete with surf boats. Bryant, Regal, Cobalt, and FourWinns are marketing pretty big boats with lots of standard items--nice stereos, etc. They also have trim tabs and ballast. For the most part, they are competing with Axis, Moomba, the cheap Tige, etc.
I think they miss the mark a bit, as one main benefit of a stern drive is trimming the props up near or above the hull depth for beaching or shoal areas. These wont trim up in the same fashion. That said, the low-speed maneuvering with the duoprop set up is pretty awesome.