(for some reason, I missed the first part of this thread...)

So, How does T-Splines and Power Sub-D NURBS compare and differ?

Could it be that aside from T-Spline's innovation with the ability to form joint intersections (start-points, tri-points), the "cage" modification is really an implementation of Sub-D? People may consider the novelty of T-Splines for its ability to act like a Sub-D platfrom, and may believe that it is only possible because of the T-intersection concept.

What this may mean is that people shouldn't be wishing for T-Splines (per se) in their NURBS application, but the ability to work an enclosed NURBS (water tight) solids by means of a Sub-D type cage system.

"Sub-D style cage", not to be confused with a "FFD deformation cage" that is on the MoI wish list. ;-)

None the less, T-Splines and Power NURBS products are pricey plug-ins for the non-commercial user.