Ok thanks for the responses, think I will try the heimdall 2 interconnects first and see if I notice a difference, hard to swallow $800 for a headphone cable for me still, wonder if I may see more benefit from adding something like the audiophileo
I look at it like this. The question isn't just about whether the cable = $800, per se, The question is whether your cans plus the cable offers better sound than another headphone or headphone/cable combo at or below the price of 'yours'. The Heimdall also offers the connectivity, out of the box to use 4-pin xlr, 1/4" or 3.5mm, so it is pretty much future-proof in terms of amp compatibility.
On inexpensive headphones, I'd probably recommend upgrading the 'phones, or a upper-level can or a flagship - cables at the level of the Heimdall will take you to the next level sonically, even if diminishing returns have set in. At the end of the day, value is not an acceptable substitute for performance.