Sadly Edwin Watts dosen't replace shafts in Callaway clubs. Oh well I think im just going to order it in regular flex and then replace it with a prolaunch next season when the shaft gets to weak.
My Girlfriend bought an ERC fusion at the begining of this year, and gained about 25-30 yards over her old driver, and it basicly completly eliminated her previous golf seasons slice. She went from moderatly slicing drives about 180. To putting a 2-5 yard draw on them, and hitting them 210 now.
I havn't tried the driver myself, as she's a righty and I'm a leftie. But it must be a pretty darn good club. She really likes it a lot.