Scott,
The Graphite shaft is really good, there is no vibration from the drive train at all...!
With the stock shaft you can feel and hear the shaft vibrating!
I know it is expensive, but I think it is worth it and it will last forever.
Maybe I can make it down to England next year, we will see!
At WLRC you might want to try a spool since the track is really small and low traction.....