Earlier quoted context omitted.
Visitor.js is arguably not very innovative. The only "added value" that I would consider is having it all in one nice library. No wireless. Less space than a Nomad. Lame.
This reply is the Slashdot review of the Apple iPod when it was released. It is a great example of how some people (incl. many geeks) look at a product/service, and only look at the raw technical specs, and presume that it's very easy to replicate or not very innovative. Since the iPod was a massive success, it shows how sometimes raw technology doesn't make or break something
I did not presume anything. You only have to look at prior HN posts to see how it is reproducible in 3 hours, one definition of easy.
Note that my comment pertained to innovation, not usefulness. I don't doubt that there is a market for visitor.js. However, I am 100% sure that it is not innovative.