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koan - 10:07 pm on Nov 5, 2008 (gmt 0)
It went through 50+ pages with an average of 2 seconds per page. I was also disappointed by their web site. I'm thinking of blocking it by UA... but at least it has one. Not sure.
Just got a visit from them also with the same UA as the original poster:
Mozilla/5.0 (compatible; WebDataCentreBot/1.0; +http://WebDataCentre.com/)