Agreed. I have a more or less exact idea of what they're doing just from the concept description as I design resin-type 3D printers at my day job. I know this concept has been tried, I think they're just the first ones to have gotten it to work.

The other thing to note is that this only works with a certain subset of polymerization reactions--not all polymerizations are oxygen inhibited so if they want to move into truly water-clear and UV stable materials this design won't work.

I really love the approach take by the Peachy Printer [1] guys. I wonder why more people aren't exploring that route (dripping system, or any water-assisted system)? It shares many of the strengths of this one but got far less attention.

I wonder how it would perform with a controllable dipping system and a DLP.

[1] http://www.peachyprinter.com/#!methods/cjg9