I recall seeing something similar to what RP is saying. Goose is better from a DPS perspective than Potency, but the advantage isnt huge... and theoretically, if youre not on top of its procs you may not get as much out of it as possible... so it may or may not reliably out-perform the Str enchant depending on play style.
It (Goose) is supposedly on a normalized 1PPM rate... so you could go 5 minutes without having it fire off, and then have it hit 5x in the next 20 seconds. That, plus the fact that its on your OH, which likely means it will miss a fair percentage of white swings, make it kindof a choppy and unreliable source of sustained (passive) damage.
When it does proc, however, it gives you a pretty sizable chunk of crit (unbuffed... ~3.6%). If you can squeeze as many specials in during that 15 seconds... especially anything that hits multiple targets... the potential extra damage from WW Crits+Deep Wounds+Flurry is kindof exciting to think about.
(Caveat: I'm in Kara/Heroic gear. The class seems almost unrecognizable at different gear threshholds when various stats become afterthoughts because you have as much as you need, so none of this is universally applicable).
Edited, Jul 1st 2008 3:29pm by soobooboo