Good for Slower Swing Speeds
I played the Z Stars for several years before switching to the Q Star Tour ball. I made the switch because I have a slower swing speed (mid 80s with driver) and I thought the Q Star Tours would give me better distance. After playing them for over a year, I felt I wasn't getting the distance and they didn't seem to hold the greens very well. I switched back to the new Z Stars and I love the difference. The Z Stars do feel harder (I prefer the feel of the Q Star Tours), but the distance is at least as good with the Z Stars (maybe a bit better) and I think I hold the greens better on iron approaches. Very glad I switched back.