Subsequent to having Gold's Factory install a Dogatti PT135 shaft in my Custom IPT putter a couple of months ago, I just got another one of these shafts for my Geo Galaxy blade.
Pressed in the tip to the hosel just now ( not glued yet ) and rolled a ball with it to see how it felt...
Wow!! This shaft makes my putters feel like magic!! Pronounced "dense feel with the edge rolled off" if that makes any sense. As pricey as they are, I think they're totally worth it.
Not only does it improve the overall feel at impact, the extra stiffness adds stability to the stroke as well.