So I have been die-hard subtlety spec since day 1, my goal to have Shadowstep was finally reached at 50 and I gotta say I loved it. yes "loved" as in past tense. As I continued on to 60 I noticed that I was beginning to take more and more damage during the course of the fight requiring me to eat or bandage fairly often.
During that time I had been reading about several other specs that intrigued me, combat fists and the infamous 30/0/31 build. I ruled out combat fists, due to lack of good fist weapons for now. For 30/0/31 I realized for it to be useful pre-70 I needed to at least be able to get Cold Blood after filling in 31 in sub. So I waited until 61 then respecced. OH EM GEE. Gotta say even lacking it's full potential (5/5 in seal fate + QR) it is quite the power house.
In some test duels with a warrior (lvl 68) If he lets me land the opening hit (CS) I can bring him down to under 30% HP before he can land any significant damage. ... unfortuanately then I have nothing left and he just smacks me a few times, but still the burst damage this build is capable of really did amaze me.
At first when I heard about this build it sounded very much like a 3-minute mage build, relying heavily on CB. But with Prep added in there to reset CB/premed/vanish as needed I have found the utility/survivability to be quite high as well.
I gotta say I am sorry I was less accepting of this build at first. So for now I'll be running this build until I can get my hands on some good fist weapons.