One comment I've heard is that since the ball is on the end of the stick that it may promote lagging the shaft as opposed to the sweetspot, but I feel relatively aware of the sweetspot lag as opposed to the shaft. (Thanks to all the good LBG and TGM advice I've had)
While I haven't seen this yet, in this case the shaft and the sweetspot may be one and the same, similar to a dowel. I will have to look into it further. Keep me posted.