Clearcasting
I had a run in with a fellow feral druid recently, this one primarily a tank. Discussing specs, he mentioned he might take Omen of Clarity again once he upgraded from Tier 8. Let me repeat.. he mentioned his current spec was lacking Omen of Clarity.. What?! How can that be, I asked.. so from there he makes the claim that the Tier 8 bonus overwrites our OoC. Dear lordy! I went looking for information, or even the claimed source for this tidbit, and returned empty handed. Sure, there are comments far and wide praising the clearcasting proc from Tier 8, but no mention of any hard testing of the ability to stack with Omen of Clarity. I, like everyone else, had made this assumption.
So now, I find myself doing something totally different. Instead of borrowing from other sources greater than myself, I went head first into testing mode (in kitty form). Results without Omen of Clarity in my spec were dismal. Less than 1PPM on Tier 8, actually approximately .85 Yet that is what we should expect, with a 2% chance and maintaining as close as humanly possible to 100% uptime on bleeds, less than 1PPM is expected. One free attack every minute is fairly underwhelming, but it’s something, right? Perhaps. I went on to look at Omen of Clarity by itself. With reasonably good haste and a mongoose enchant, I was varying considerably between 4.5 and 3.5 PPM. So much better. My surprise came trying to combine the two. I was unable to discern any difference between having my Tier 8 set bonus and not. Neither chestpiece had haste as a stat, so it was an even trade. I continued to show 3.5 PPM for clearcasting and this caused me to try again both with and without my tier bonus. I’m not jumping to any immediate conclusions. Let me repeat that: I’m wholeheartedly NOT prepared to make any claims based on a mere hour or less of testing. The RNG can indeed be a pain. There’s no reason Tier 8 shouldn’t work with Omen of Clarity, truthfully. It isn’t logical. However, my results thus far are disturbing. Therefore do I ask – has anyone else tested the Tier bonus lately?

I don’t use OoC in my tanking build. I see no purpose when that pint could be spent for more threat or avoidance. But a feral dps without it would be worthless. We all know how much of a pain dpsing with a bear build can be! Awesome site!
Also OoC has been a required talent since I started really raiding Kara/Mags early in TBC.