I agree with pretty much everything John (Jafox) has said. I also prefer the Jade cables. However, it is true that I have found gold cables in general to have a strong sense of harmonic textures that I enjoy. I've also heard gold cables from Gabriel Gold and Awesound. IMHO they all have a similar harmonic 'rightness' to the notes that makes gold so addictive. I prefer the way the Jade soundstages though, and the notes decay into a black space. It sounds more natural to me.
The one problem I have with cable manufacturers in general is that many tend to keep increasing the 'break-in' period, but they don't seem to be increasing the money back guarantee trial period. I've had other manufacturers besides GG originally tell me that 100-150 hours would be sufficient. When I hit that mark, if I'm not impressed, the number increases to 300-400. Virtual Dynamics did this to me as well. When I explain that that many hours would put me past the return window, I then realized that is probably the intention of it.
From my cable burn in experiences, I believe a cable may keep developing for 100-1000 hours, but I would say that 90% of the burn in occurs in the first 100 hours. FWIW, I felt Jade Vermeil cables changed more in the first 100 hours of any cable I've ever heard, that includes the Jade Hybrid and Gold. I can't explain why though.
After 100 hours with a cable, if I haven't heard improvement, or it's not in the ballpark, I tend to move on. I find it difficult to believe that a cable I've listened to for 100 hours and have mixed feelings about will all of a sudden just bloom into wonder cable after 300-400 hours. If this possibility does exist, cable manufacturers will need to extend their money back guarantee period to 90 days or longer. Otherwise I'm tempted to believe that this number is just extended to take you past the return date trying to burn the cable in. Call me cynical if you must, but that's my $0.02.
Cheers,
John