The GO-2 has a more conical like taper. The new GO-2(SL) shaft has a pro taper.
I tried a 12.5mm GO-2, deflection was slightly more than my Ignite.
Out of all CF shafts I've tried, the GO-2 feels most like a maple shaft, nice natural hit.
Matchroom is streaming it live on their various facebook pages. Not sure if it's blocked in US though.
I'm watching it on this one:
https://www.facebook.com/usopen9ball/videos/3314249448600761/
Ignite taper is more like the (pro) taper of the 700, only quite a bit longer.
Compared to the ExPro, the Ignite has more power, less deflection, stiffer, and taper feels more comfortable (especially with a close bridge).
I've only tried the Ignite for 30 minutes, but it has amazing power transfer and the amount of deflection is very very low (lower than the Revo 12.9mm)
I currently play with the WX700 and have played with the Ex-Pro and HP2 the past year and the Ignite really is on a different level deflection wise.