Max format: Max file includes materials and unique scene setup (for vray 1.47 or high)of studio renders which you can see on previews.
File includes maps, special HDRI and polygonal model with applied meshsmooth, so you can change model quality as you like. All textures are included.

3ds format: File includes polygonal model with high, medium and low count of polygons, three types of meshsmooth.
SubD 0 (low)    - 201404
SubD 1 (medium) - 593368
SubD 2 (high)   - 1091368

Lwo format: File includes polygonal model with one resolution, 201404 faces.

Obj format: File includes polygonal model with high, medium and low count of polygons, three types of meshsmooth.
SubD 0 (low)   - 141296
SubD 1 (medium)- 593356
SubD 2 (high) - 1091366