I currently own a mixture of Blue Heavens (which I'm phasing out - only one pair left), Red Dawns, and Heimdalls. In my system, I heard real improvements with the Heimdalls over the Red Dawns (which were only a marginal improvement over the Blue Heavens). The Heimdalls are more transparent, reveal more detail and depth/dimensionality, and have excellent transient response. I now intend to upgrade all of the cabling in my system from Red Dawns to Heimdalls, which are by a significant margin the best cables I've ever heard (or not heard...) in my system.
