I love my original Cruel C51 and have been thinking about getting a 2Cruel. I was wondering for those of you that have both what if any differences are there between the two that you have noticed?

Very large difference in inherent reaction shapes.

C51 is early, smooth, strong.

2Cruel can be lengthy, quick reacting and angular.

Of course, your mileage may vary, depending on layout, style, ball surface, lane surface and conditions, but all things being equal, they are pretty different.