If you watch the demo videos, the peformance (latency/accuracy) seems the same as LEAP. Unfortunately, the LEAP restricts access to raw camera data for proprietary/IP reasons. Finally, the Duo3D has open-source drivers - 'nuff said.
Both look pretty interesting, but as you said the Duo3D is more open which makes me more interested in that project. Though they are also charging more to get all the parts that you still need to assemble yourself.
I've been thinking recently about looking for a Kinect alternative to mess around with some 3D scanning ideas I want to work on. I really didn't want any of my money fueling the Microsoft war effort so it is really cool to have a few alternatives to choose from.
Haven't done much in the way of assembling electronics, but maybe now is the time to get my hands dirty and give Duo3D a go at either the $20 or $40 levels that gives the plans needed to make my own. Getting the case at the $40 level is nice to, though I wonder if the 3d printing can be done for less than $20.