I wonder if weight is critical for how Fission holds up. All my 160g+ Fission discs (Volts, Teslas, and Photons) have all held up well. The Teslas and Photons seems to beat in a bit quicker compared to Fission Volts. Most of my Fission Volts I would classify as pretty firm with only a little of give to the flight plate. Any Fission below 150 beats in faster and goes towards the US side much faster. The flight plates are also softer and appear a bit thinner. They also tend to bubble and warp with harder hits to trees or the ground. The Photons and Teslas that I have below 140g are really squirrley yet fun to throw, but I haven't given them enough course time to figure them out. The only sub 160g Fission I bag is a 145g Fission Teslas. It is hyzerflips easily and holds a great Left to Right shot. It takes the slot in my bag that I had for a Virus before. I wonder if most of this has to do with the type of plastic and the ratio between the rim and the flight plate. The sub-150g Fission discs appear to me to have a bit more of the gyroscopic effect with less effort. I remember when I first threw MVP, I was less convinced of the gyro affect. Through the years and countless rounds, my game and throwing have improved. Now I can appreciate how these discs work, but it does require a bit more rotational force when throwing (I guess what most people call SNAP). The couple of 130's g Teslas and Photons I have bomb but are not good in headwinds or any release at full power.