Update on the demos - The TAIII in raw finished arrived - and I've tried them out in 2 range sessions. The 639 MB Plus are out of the running.
The TAIII have dynamic gold S300 shafts - RAW finish
The 639 CB are KBS Tour R shafts - Black Finish
my monitor shows same swing speed and ball speed for both clubs
After looking at the RAW finish vs the Black I'm leaning towards the RAW finish just in how it feels when touching the club, it also has a nice metal smell that i noticed when inspecting the clubs.
The TAIII is winning based on feel when hitting the ball and the fact that the mis-hits are no worse than the 639 CBs.
I was fit into a steelfiber shaft R flex at club champion and now hope that this shaft would apply to these heads.
Luckily I'm close to Sub70 only 40 miles so I can get fit at their building.
Thanks to @JaySub70 for passing along info on Cody who runs the demo program, otherwise I would not have received the TAIII demos.