To the original Question -
No. Lots of lower level Open players like myself putt with MVP all over the country, but we are in the vast minority in the Open division. I try a delicate "fanboy" balance. I love their discs, but also recognize that there are many many wonderful discs out there. It all comes down to preference. I recently played 7-8 rounds in a row where I switched out my whole bag every round for fun. I shot nearly identical every round. I still prefer MVP, but I can shoot the same with anything else.