dForce, used correctly, can create some stunning effects for cloth, making it move or pose more naturally than the rather stiff default settings.
dForce, however, is crap. As many things DAZ, it's... a good idea, poorly executed. Among other things, its physics sim is... flawed, at best, and the controls aren't very good either.
Basically, applying dForce to a non-dForce enabled item usually ends up in "not so good" effects (it can work, by all means, but it's a bit of a hit or miss situation). dForce ready assets, on the other hand, where the dForce sets have beenn added and tested beforehand, are usually a lot better than the non-dForce equivalents, simply because they move and behave more naturally.