I have had the opposite experience - once did a budget cable shoot out over the course of two or three weeks with these, Audio Art, Morrow, Anti-Cables, and a few others, and the Mapleshades lost, badly. YMMV, of course, as I find cables are oh so system dependent.
fyi, I find many if not all of their "free tweaks" ridiculous - such as cutting the phase plugs off all tweeters (!), tilting back all speakers, and sitting on the floor to listen. yikes.
There are several other threads on these cables here, you may want to check them out.