Depends what you need. Everythin including GI is baked into the mesh.
If you want dynamic lights, you could try to bake a out the scene as diffuse and then again as normal maps. Then you can have simplified realitime illumination while still baking in AO, static diffuse lights, and the LODed mesh.
If you want dynamic lights, you could try to bake a out the scene as diffuse and then again as normal maps. Then you can have simplified realitime illumination while still baking in AO, static diffuse lights, and the LODed mesh.