Not very accurate. I've cracked 2600 a couple of times, and others have told me that they have had ratings very, very far off. It doesn't really matter. The web domain was not renewed, and so was pulled down on 4/4. I suspect that their inability to raise funds for R&D led to their demise, and which was a consequence of the unproven nature of their concept (and script).
Chesszen: How accurate?
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I've tried it myself and it was almost dead on for that expert who beat me but underestimates the 1250 I defeated by quite a bit. Maybe it's inflated in my case here and even the 1700 it estimated I was against the expert although 1950 is pretty good: