Hey Jerry, I tried them a long time ago, maybe in the early/mid 90's sometime.
Back when they were made in the USA, and Roger Skoff was still running the company.
Decent cables, similar to Tara Labs in that both are made of copper, but have the speed and resolution associated with a silver cable.
Neither has the typical warmth of copper, though XLO had more prodigious bass as I recall, while Tara Labs had a bit more air in the highs.
I think what killed XLO was the fraud cables. Now fraud cables have hurt a lot of cable companies, Cardas, Audioquest, Tara Labs, XLO, etc.
However, the effects of fraud seem to have hurt XLO much more than the other brands.
XLO dropped their two top lines, the Unlimited and the Limited, mainly due to fakes coming out of China. The Signature is now their top of the line.