Hi!
Very fresh example: instantbodyhealer.com Not listed in any SURBL list at the moment. NS servers IPs listed in SBL since May 2nd.
That same page i added a zillion times with all kinds of .biz ones, so sure, in those cases it will work. But! Most likely a REGULAR rbl would also block those. If you list them there.
As the SBL catches the first run of the "new domain of the day" from certain domain morphing spammers that isn't caught by SURBLs, I can live with some extra dns lookups and potential time-outs.
But I agree, they are complementary.
Very true.
Bye, Raymond.