Negative rake = blade does not have a tendency to pull the workpiece into
the blade. Allows more user control of the workpiece.
Positive rake = blade has a slight tendency to pull the workpiece into the
blade. Allows easier feeding and sometimes faster cutting, but often not as
safe or as accurate.

You will likely find negative rake on all good dado sets.
FWIW, I have an SD208 set and had no problems so far.

If you are after some good info/review on the Infinity Dado Set, try he
http://www.onlinetoolreviews.com/rev...ydadonator.htm

--
Regards,

Dean Bielanowski
Editor,
Online Tool Reviews
http://www.onlinetoolreviews.com
Over 50 woodworking product reviews online!
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