Adjust the smoothness by increasing or decreasing the number of smoothing iterations.
Toggle subdivision off to return to the control-mesh whenever you need to edit the geometry.
Create creases in the subdivided mesh to refine the shape without having to add extra control loops in the control mesh.
SUbD uses a Catmull-Clark based algorithm for the subdivision. This type of subdivision is optimized for quadrilaterals.
For each subdivision each quad produce four new quads.
Each triangle produce three new quads.
Other polygons are triangulated prior to subdivision.
Purchase one license for $40 using PayPal.
A license allows one person to use SUbD on any number of machines, but the license cannot be shared with anyone else.
Incremental updates (x.1, x.2 etc.) are free.