I switched from a 2011 non kash RC4 to a 2012 Kashima RC4 on the same bike. Both shocks were tuned for the bike and the same coil was used. I did notice a reduction in stiction. I didn't think the Kash would make much difference on a shock and I was surprised when it did. I even went back to the non Kashima shock for a day to compare.
Is it worth the extra expense? That's like asking if Titanium bolts are worth it for weight reduction.
