I gravitate towards using Cycles for Superfly renders because I have strict control over the shaders in the Material Room.  But you need to use the correct nodes corresponding to each root node and render engine.  I wouldn't use the PoserSurface node for Superfly; you will see some strange effects with Cycle-related nodes. Replace it with the PhysicalSurface node, which can accommodate both legacy nodes and some mathematical Cycles nodes. Using legacy nodes in Cycles-based materials may not interact well.