I have used I-2 only once and don't know much about it.
However, I have either had/have other technology shafts such as:
z, 314, OB-1 (12.75), OB-1 (12.3), new x-shaft (13.0).
z - too hard to play with same goes with z-2, lots of spin hard to control.
Not recommended.
314 - feedback could be better, good spin and power; 314-2 has better feel I like that one;
Good shaft.
X- would be good for C, B players. Easy to use. Good control. Up and down kind of shooting, Good to learn how to hit a ball in the middle, and with left and right English. Not much power. This is the stiffest shaft I have ever seen. Hard to induce spin, easy to kill the ball.
Not sure yet.
OB-1 (12.75) outstanding, lots of spin, good control, lots of power, great feel.
It is a lively shaft. Requires some ability to be effective.
Best shaft hands down.