I never had problems using it. You probably have to assign the textures to the materials again, but well it's not that much of work either and you only have to do it once.
That reminds me. Is there a specific material restriction in Unity (materials you use on models in max)? In most engines I have seen that they will only show the models with proper textures when they are using Standard and Multi/Sub (some don't even have this... like Torque).
Are there any specific restrictions when working with materials in max at all? (is there any shader restriction as well? like you are stuck with Blinn or something similar?)
