Lots of people based on what I found from a forum search here when I was upgrading my sspeaker cables several months ago. I ended up going with the Alpha Core Goertz MI-2 Veracity, but the Speltz were very intriguing and many people here seem to enjoy them.
ANTI-CABLES by Paul Speltz: Anyone Using Them?
I find myself intrigued the Speltz speaker-cable option, in part because the prices are like zero when compared to most speaker cables, but I wouldn't mind reading reactions beyond those he includes in his ads and on his web site.
Low-power tube amp to single-driver speakers
Low-power tube amp to single-driver speakers