I have a bag full of Nunchuks
Driver, 4 wood, 2,3 4, Hybrid (335) and 5 - SW with xi's
I just returned from a vacation where I was able to play several rounds with the new xi's.
I believe that the xi's offer all of the performance and accuracy of steel with all of the advantages of graphite.
What I noticed was that these shafts are very forgiving on mis-hits. As an amateur I have several during a round and that may never change.
They are very straight yet easy to work...