Haha, listen.. its a known fact MVP adds the weight agent to the plastic in the rim overmold only. This ensures most of the weight is at the VERY edge of the disc. If you have ever taken a physics class (maybe you didn't have one in high school? or maybe you haven't gone to college?) your teacher/professor has probably demonstrated a bicycle wheel or some sort of disc spinning fast generating a property called
gyroscopic. Now if you understand this property, you should understand that if a disc has more weight in the edge, it will have more of a gyroscopic effect while it spins.
This means that MVP discs will hold lines longer than normal discs would. That is why MVP discs such as the axis are able to hold dead flat, straight lines much longer. The gyro tech enables the disc to fight the natural turn/fades that the disc wants to shape because the gyro tech is resisting.
Do other disc companies do this? NO.. They mix it in with the entire disc.
Not sure how else to explain it.