I have been working with Rob and Shadow for over 10 years. They are my go to supplier when I need mold flow and FEA work. If you need a non-linear, FEA / Mold Flow done these are the guys to call. The more complicated the work the more value they provide! They understand that plastic parts are not typically homogeneous and they very accuratly show you where your problems will be and offer options to fix them before you cut steel.