One thing about subdivision modelling in C2 versus Amapi is you have a slider in C2 to control the subdivisions or "smoothing" which can be increased or lowered at any time. AFAIK, at least in amapi 5.15, a smoothing operation is a one time deal that greatly increases the amount of polys in an object. Therefore, it may be easier to control the poly count in C2. This subdivision algorithm was in 1.1, but did little more than to triangulate existing polys and didn't smooth much. It also does not care how many points are a the poly, since the triangulation method is far more flexible in this respect. The C2 upgrade is a full new install... You can have both apps installed (and running) simultaneously. The C2 folder is set separately from 1.1 by default. Note: Most of the presets are the same as 1.1.