http://i.imgur.com/64vMdlb.jpg
Here is a by target model of how our Trinkets perform. It's important to realize that its actually pretty good on any amount of 3+ target
sustained AoE, but as soon as you have any amount of single target it drops down sharply.
Although these tests were done as Fury, it's about the same as Arms. I imagine it would be good on the standard Arms fights, but it's important to understand when/how you benefit from it. I bet Spoils would be an amazing FFC fight, due to near 100% Cleaving, though the targets die very fast.
Also don't forget you can go back into ToT as part of a cross realm raid group now, so if you have one good 2hr from SoO but nothing to pair it with, maybe you can get a good cross realm group to go in and beast it up for another drop. Mogu Runes can be bought on the Timeless Isle, and everything in ToT got a 20% (I think?) nerf!
Open Raid is a great website for finding cross realm groups, or just make your own.