I checked a few hundred posts and didn't see anything on this unless it's deep in another topic. I had always skipped over this spec either going with an Affliction or Destro spec for raids. However, since switching to it I do awesome damage.
Couple downsides that I can tell are it's mobility. Since I'm spamming SB's it's hard to be mobile. Also, I tend to go out of mana pretty fast but I must admit I tend to drain life a little too late. Last, it's not as efficient as afflic when farming but you can get by.
Anyway, I have noticed that my DPS has gone way up. What's nice about it is if I'm doing a heroic and I'm on CC duty I get a 20% increase in damage with the succy out. If I have my Imp out during a raid I get a nice 20% threat reduction which is also very nice.
I've read a lot about it and have heard positives and negatives but wanted to hear what you guys thought since I monitor these boards more than any other. Thanks!