i just have to chime in that while the cables didn't work with my amp (Luxman M900 U---either the binding posts were too oddly shaped OR the amp didn't like the inductance), Jeff Smith turned out to be everything an audiophile could hope for.
despite the fact that my cables were returned in 'not nearly as new' condition, i received a full refund.
Jeff is the kind of man you can be confident in doing business with. and with a 30 day trial, there's 0.0 risk for you.
(no comment on the cables, as i never heard them)