When i buy a new disc like my Volt or Amp, i try to buy a good variety usualy 4-5 discs
each of varying colors/weights.. this way i can get a good feel for how the variation affects flight. In the case of MVP discs its very small variance usually. maybe only 5-10% difference.
But with stuff from Innova its good to buy multiples because there will always be discs that fly completely different with huge variation so it becomes even more important to buy more to find the one you want.