Rob wants to put this through proper clinical trials:
http://www.youtube.com/watch?v=jTkuvppi334As of now it hasn't existed for more than a few months so it's a little hard to give sources for trying it for "years".
Additionally, Rob strongly suggests NOT eating it every day.
As for problems arising months (or years), there's also a post about that too: http://robrhinehart.com/?p=570