So I managed to get Garrosh down on two of my characters this week, which I consider quite an accomplishment given how difficult the fight is. My first attempt on Tuesday night on my warlock, I gave up after several hours and 9 stacks of determination. I finally went back to it on Friday evening and was able to get him down. With only 6-7 stacks this time.
I then went back with a guild group on Saturday night on my death knight and managed to get him down on the third try. Go guild group!
So that's two down and nine more to go. At the moment, only 6 of those 9 are actually geared enough to get into Siege of Orgrimmar, so I've got some ToT work to eventually do on 3 of them. I plan on taking a shot at it on my hunter tonight, who is the only other toon that I have that has also finished the third wing.
The fight itself is pretty interesting and there seem to be a few pretty simple keys to getting it done properly.
First, you need someone you can count on taking down one of the engineers. It's a relatively easy job. For my warlock, it's a one chaos bolt type of task, so I can portal over, blast him with the bolt, and get right back to helping with adds.
Second, folks with interrupts need to be focusing on the Far Seer's right away with strong AoE taking down the rest of the adds. During phase 2, it's mostly being aware of the ramifications of the empowered abilities are, taking out mind controlled players as quickly as possible and interrupting their casts always.
Once people get the priorities on the adds right and really start hitting on the interrupts, it is actually a pretty straightforward fight from there.
For the other 5 toons in SoO, my druid and priest have both done the first wing but nothing more. My shaman, monk and mage haven't done any of SoO at this point so will all be starting from scratch. At this point, given the amount of time it is taking to run each of these wings, it will likely be a long time before I get all of this done.