1) Nice features ResErect plugin are that in 3dsmax imported SPLINE/PATCH model with texture.
2) Imports in 3dsmax needed not for the animation, but for use different renderers - VRAY, MentalRay, Maxwell, FinalRender, Brazil, Renderman .... and many many others renders.
3) Unfortunately *.X files do not transfer the animation points (CP). This problem was partially solves the MDD export.
I would like to have an integrated option to export animations (bones + CP's + FX)