I have ST-5700 shifters on my bike and recently purchased a set of BR-7900 Dura Ace brakes. According to the Shimano website, they should work just fine. The entry for the shifters on their website states:
"Available in silver or black the new 105 levers are compatible with Ultegra 6700 and Dura-Ace 7900 brake arches"
I also found a compatibility chart floating around (below):
So, it would appear that this combination should work. My question is: Has anyone done this/does anyone have direct experience with this combination?