Yes we were able to use the harp. Has anyone else had problems with the motion +?
Problems? What kind of problems?
If you mean that it doesn't aim correctly, then you can easily fix that.
Press D-Pad down in the main menu before selecting what to play (while aiming at the center of the screen).
If it somehow desyncs during gameplay, press 1 to bring up the controller menu, and press D-Pad down again to sync it.
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Here is my attempt at speedrunning the dungeon demo (5:03):
http://www.youtube.com/watch?v=Rmq_IvOfeFoI could not find a single good run on youtube. I found some runs, but they didn't know about the shortcut after the boss key (I'm not surprised really, you pretty much have to find and test everything yourself now as the game is new).
And then there is many other time savers that people didn't use. (they usually kill the monsters attached to the roof in the main room before walking over the rope for example. If you keep your balance and sprint over, you won't get hit. Some people can't keep the balance though...)
I did do a few minor mistakes myself, but nothing horrible. sub 5 is obviously possible.