Hi M-dynamics,

Cad loader and Subd-Nurbs are 2 different beast :

Cad loader let you import cad data into modo (igs, step, parasolid stuff)
Integrityware Power SubD-Nurbs let you export sub-d from Modo into nurbs format (igs, step, rhino I guess)

I use none of them.

Cad loader meshing is terrible compared to what MoI can produce. During the beta phase I didnt get a single good import from MoI models (using step or igs). It's not a true ngones mesher either. For me it was useless.

Power Sub-D surface get some trouble with pole aera (high valence vertex). While not perfect, T-Spline gives much better result.
Maybe some progress has be done since (again I'm talking about beta version)