I have the gamepak addon and have milkshape export

the problems are animations lost (in any format I try, directx export, trought milkshape)

you can export static model with one texture (but need to use only .bmp, when try to import a model with texture in .tga or .dds the effects in med and wed are psicodelic textures "unkomon iverted colors")

the .obj in truespace is very bad and the import of .obj in med are good
truespace 7.5 have greats things(physics, animation...)
but the exported formats need improvements (support g6 .mdl but very bad if better to expor to milkshape and later to .mdl) (if you like to use for static model's are ok but by the moment for animations "if export in directx a model with two or more objects with two or more textures you have the uv bad)

I hope the new truespace 7.6 have .fbx

I export every model with diferent textures by parts and import in med with the apped option is the only form I can use