imcoola: I tryed the i15s out. They are the best Irons in the game by far in my opinion IF you can handle the meter speed. If you can't handle it I would stay at the G10s. There is a definite difference between the G10 Meter Speed and the i15 Meter Speed. But the Precision Forgiviness and Spin is even better than on the G10.
regards
That is about what I saw out of them also. The spin not so much, but you could be right. What I would tell anyone is play the G10s without the help of a GI ball. If you feel like you handle that speed, then the I15s may be playable for you.
I was just way too clumsy with the meter, and this is coming from someone who played with the g10s a very long time without the help of a GI ball. Tried to give it a good long time with the i15s, but finally just got fed up with the fast meter.