Though "Absolutely no domainer takes estibot seriously" is a bit of an exaggeration, I think.
Estibot is regularly mentioned on TheDomains.com (widely seen as the authority on domain name market news).
Mentioned here for example: http://www.thedomains.com/2008/05/11/using-estibotcom-what-a...
http://www.thedomains.com/2011/11/03/ira-com-sells-for-seven...
Of course it's an automated tool and is not perfect. But it can be used as a reference point.