Sweet Rockers and WRSI helmets seem to be the only helmets I've seen that offer the greatimpact absorption in addition to the impact dissipation that kayak helmets offer. The WRSI is darn near two helmets, one inside the other. Similarly, the Rocker has enough absorption capability to pass and probably exceed CE EN 1077 (downhill skiing helmet standard).
But which offers better protection? Is the Rocker really worth paying 3X as much $$$?
For comparison's sakes lets compare the WRSI to the Rocker hc LE... or the WRSI + EPS to the S1 fc LE

S1 hc LE

WRSI

S1 fc

WRSI + EPS