I'm looking st the dock for no other reason than that is a specifically designed dock. No fiddling with cables, no buying additional accessories, you just drop the machine in there and bingo, you're good to go. Saying that, an advantage of using a wired dock, and in my opinion, a HUGE one, is that you can still use the surface switch the kickstand. All your important documents or work etc on your screens, with an easy to maneuver digital notepad at your hand with the surface dock, note taking and such becomes slightly less viable IMO.
i swear by the docking station for the SP2. drop it in, close it, bam your done.
no worries about the poor USB plug you are messing with all the time.
you can even have it set to turn off the SPs screen when you use the dicking station.
Im sure that helps keep it cool. it dose get mighty hot when playing around with 3Dmax or Corel or games.