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But I haven't seen the actual WWS for it as yet. If I had to guess, 4 is a bit optimistic and I'd expect more like 1 or 2ppm. WowWiki has it at 10% (to which I have to ask "10% of WHAT!?"), but it's normalized, so...
I've only done or watched testing by spells, but it's pretty much exactly every 20 seconds for us. Supposedly 20-second internal cooldown, but one cooldown for spells and one for melee, which what testing I did makes sense (minimum 20 seconds between spell procs, but can get spell proc -> melee proc within seconds of each other).
The only class it seems anywhere close to good for is enhance shammies, and purely for slowing boss spells down (supposedly it works on raid bosses).