I can report after two rounds I am in love with these!
Coming from off the shelf Taylormade M2 irons the feel is unbelievable and the shaft has definitely helped turn my average 7 iron 20 ft fade into a 10 foot baby fade and it feels much more consistent.
Oh and they look fantastic!
Edit...
I have just returned from a Mizuno fitting at Bearwood lakes and ordered:
JPX 921 Forged
4-PW, GW
KBS $ taper 130 X
Std length
2* Up
MCC Black/white align
Very excited!