Dueled my friend who is a Battlemaster Shadow(I am also Battlemaster as of last night), I am full champion gear which puts me at about 60 something expertise less or so if he has full Battlemaster(I don't think he does though).
I'm watchmen spec.
So anyway, it went like this. Resoluted his initial stun, his first real attack out of stealth took me down to 50% health, which I immediately popped both my defensive cooldowns and then got stunned one more time and lost the duel without enough time even to do Guarded by the Force and pop a stim.
Have you guys tried dueling a heavily geared lvl 50 shadow before? I'm curious how it went for you as well.