Now that it's been extended to 15 seconds (versus 12) before it falls off, I wanted to share my experiences with it and encourage other alliance pallies who may have opted for SoR in the past to reconsider.
Tanking VR, sometimes SoV would fall off for seemingly no good reason, especially after taking a knock-away. This could be minimized by paying close attention and waiting to judge/reseal if there were only a few seconds left before it would fall off. Often I'd look up mid-fight and see that I'd have 3 applications of the dot when I would have expected to still be at 5. Even with this issue my threat proved better with SoV than SoR.
After 2.2, I didn't have SoV fall off VR at all last week. For the entire duration of the fight I was able to maintain the 5 stacks that were applied with wings up so I had that 20% bonus the entire time. We set a new in-guild record of 8 minutes 6 seconds to kill him.
On Gruul, I found that in most cases I was able to keep SoV up through the ground slam/shatter. Prior to 2.2 this was occasional. It's not 100% but pretty consistent now. On Magtheridon, I used to sometimes lose SoV when he started bouncing me around. Not any more.
Also, I <3 Flask of Blinding Light
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