Skycall totem will ensure that you get a.) carpal tunnel or b.) banned for using a G15's auto-repeat features. Every shaman's cast timers will be out of whack, guaranteed. Totem of the Void is superior for burst in PvP and is darn handy in PvE. I also have the Totems of the Pulsing earth (-27mana/LB), which I highly recommend for PvE farming. I can do an entire LPS farm run of Steamvaults and need to drink less than three times with that baby equipped. I also like it for my raiding shaman in situations where I'm not grouped with a shadowpriest.