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Those are some bold claims. I tried their demo, and indeed it does all the usual things like firstChild, nextSibling, parentNode, blah blah blah.
I can't vouch for it being faster or better than anything else. But their description does sound convincing. It uses more memory than SAX, less than DOM; runs faster than SAX and DOM.
This is tech to investigate if you have an app that parses massive amounts of XML.