I have had my nvd for a couple of years now and its still the strongest ball I have had. I have had a cell,vg,mutant cell,mission,mega recovery,,920a,mean machine and lastly a bank. The bank may be stronger,but its not as user friendly. I hadn't been using it because i thought it had died,but because I have been struggling so with new stuff I decided to go in the closet.
I have shot it on the two most challenging shots i face and it has shown itself to be head and shoulders above every thing else I have been trying. I am still struggling,but its not the ball. I know what ball to go to when everything else is sliding and I can even play it for the full set and I am usually changing 3 or 4 times during a set trying to find the right look. Carry,recovery,forgiveness,versatility,readability for my money its the nvd for heavier shots.
--------------------
my style, the art of bowling without bowling