Worth it? Sheesh, I dunno. I spent the money, so of course i'll try to justify it.
It handles differently. Smoother. There is a strange severe vibration as I pass thru zero pitch in idle-up, I don't know if it is the head or what, still experimenting.
I don't like the method for holding it on the shaft. Instead of using a shear pin, it uses two tiny little setscrews that are supposed to clamp down on the shaft at the pin hole. The screws work loose even with a bit of Tamiya threadlocker, I'm afraid to use anything stronger because they are so small. This is definitely a check-before-each-flight item.
I like it, I need to tune it, it looks nice, the damping seems a bit stiff, it feels different. I may have to figure out how to adjust the Bell-Hiller mix, probably by modifying the mixer arms to accept a link ball in a different location if that is possible.

SuperSkids V.3, as Choppersrule/Dave suggested. Hopefully Monday or Tuesday, or who knows when. Sorry I don't have the link in front of me, I'll try to find it.