Using Splinewarp in Nuke to matchmove or stabilize

I just came across this interesting technique that Magno Borgo came up with for using the Splinewarp in Nuke as a cunning way to achieve a multipoint track of an object (good for organic shapes that need to warp more than the 4 points of a corner-pin you might get from Mocha or using the planar_project gizmo might do).  More