What were you seeing in the two heads relative to each other?
Pretty close performance wise for me. Both had identical max ballspeed and similar average yesterday. Similar peak height, similar carry, both setup at 9* (12g back in the RadSpeed). They even have similar slightly firm feel to them, which is not a bad thing. If anything, I think the Cobra may play a slightly flatter ball flight for me. I had a few drop into the sub 2k zone with RadSpeed like 16xx and 17xx rpm on a toe-side draw, which is a little bit of a warning flag for me. The TSi3 stayed above 2k rpm on mishit, ie. I almost missed one off the toe, all the way off the face, and still spun about 2200 and finished on target, with very surprising ballspeed retention.