Can't beat the Performance or Value
The Srixon Z-Star is fantastic! Compared to the Z-Star XV it feels much softer. I don't feel as if I lost any distance either. So, if the Z-Star is soft feeling and has great spin into greens (on edge of being too spiny from mid irons), and great distance then it's a no brainer. I love the Z-Star. It's a better performer than Chrome Soft. It's about even with TP5 but much cheaper. So go with Z-Star if you want all the performance, perhaps, without the name recognition.
I got it with XL Align and it has helped my putting immensely along with my training Wellputt mat I've gone from 2.33 putts per green to 1.78.