I have been doing a lot of PvP for the past few weeks and I constantly find myself changing specs. I used to be Assassination at the start and had decent success with it, but I found it boring since that is my PvE Spec as well. So I went to Subtlety since I heard of its strengths, and failed miserably. (Most likely due to my unfamiliarity with the class) But I felt like I did next to no damage and could never get into position for backstab.
After about a week of that I went combat. I liked the change of killing spree only hitting one target if Blade Flurry isn't active, but I ran into constant energy issues. After seeing the POSSIBLE lvl 100 talent of creating a shadow of yourself that copies abilities I though double killing spree would be powerful. But little success for the moment.
So I ask you other Rogues, what is your favorite PvP Spec, why, and how long has that been your PvP Spec?