One of Wilson's higher-ups lives in my area and I was able to hit the Clash and chat with him about it last night. He states that it has a stiffness below 50 but the power of a Pure Drive/Ultra. I can confirm the power claims, as the ball launched off my strings compared to the Ultra Tour I've been using lately. Once I started going for my strokes with a little less zeal, I was rewarded with great depth and nice directional control, maybe because the flex is lower than competing frames. Injecting pace or going for an angle on a short ball was easily done, and there was significantly less vagueness of accuracy compared to the Ultra 100 or Pure Drive/Aero. Volleys were surprisingly nice, and I found myself with more touch than expected throughout the session. This frame is maneuverable but stable, and you can actually feel some flex when blocking back a laser or going for a drop volley. Serving was about on par with other tweeners--lots of power and spin on tap.
It's not my kind of frame at this time (read: I'm still young and like to swing hard), but I will definitely teach with it and could see myself picking it up when I give up on heavier, control-oriented sticks.
I'm not sure I buy the stiffness being all the way into the 40s, but it's certainly lower than most other frames similar to it. I have been fighting some wrist injuries lately, and I'd say this is on par or better than my Ultra Tour for comfort. The playability of the racquet reaches a wider audience than thin beam, flexible sticks, though, so I think that's great. This is something I could give to the 3.5 club player to who insists he "NEEDS" poly (even though his elbow has swelled to the size of a grapefruit) to replace his Pure Drive Tour+ with 2-year-old 4G. It's definitely going to help mitigate the negative effects of polyester strings for us mortal players, which I think is fantastic. And it plays pretty well too!