>> If Google honors your take down request the offending site (or page) will be removed from Serps and it will be replaced by a notification saying something like, some results have been removed due to [take down request].
Took google six months to get back to us on the DMCA notice and by that time the scraper had moved to a new site. Worth going through the rituals? I'm not too sure.
Better points of attack are the host. Unfortunately, they moved from their US host to a European host who required a whole bunch of other paper work.
To google's credit, their algorithms seem a little bit better now compared to jan / feb of this year and the guys have a hard time ranking against us.