xmagusx,
The 3D layout is amazing. I have tried the Kinesis advantage, and to be honest its pretty obvious they completely ripped off the Maltron 3D keyboard without fully understanding it.
The keys on the Maltron keyboard are a bit more angled towards the typists fingers, and the net effect is less wrist pronation. Having typed on both, I think it is pretty obvious Lilian Malt designed a keyboard very carefully to help with RSI of both the wrist and fingers, Kinesis saw an opportunity to cash in on Malt's innovative design by ripping it off and mass manufacturing it.
Maltron keyboards are hand wired in a small shop in England. Yes, they cost more, but I sleep easy at night knowing I am supporting a company with integrity. They are also very pleasant to deal with from a support perspective.
If Datahand ever gets their act together, I will end up switching, or if someone decides to make a Datahand clone I might consider it, but for touch typists suffering from RSI, there is currently no better general solution than the Maltron 3D keyboard(make sure to ask for brown keyswitches if you order one, I LIKE my Maltron with blacks but my next one will definitely have browns).