Hiernote you are right. 250-300 hours of burning-in is more like it. 150 is not even close. Steve confirmed it.
I just recently bought (1)3m pair and (2)1m pair of GG Revelation.I just tested a 1m pair connected to my work system - B W 602s3,Cambridge Audio 640v2,Audio Note DAC 2 Sig, and PC as transport.
At first i noticed improvements in timbre and vocals (midrange alltogether).Then i noticed brightness and lack of bass.
-After 10 hours, some bass appeared.
-After 50 hours, more bass,less bright.
-After 150 hours,the same improvement, in smaller quantity.
At 220 hours i tested them in three very different systems.
They won over other ICs, but i was NOT satisfied.
In my system, they performed worse than other IC (Ixos).
Ixos had much better bass and tonal balance.I though GG was only for vocal and jazz music.As a heavy metal listener (mainly) i was not very happy with my GG.
-At 230-240 hours,HUGE improvement.No more brightness,no more metalized treble, and bass appeared.Real bass.
After 330 hours i tested them in my system against Ixos again.This time Gabriel won clearly.Even bass was better with Gabriel,GG won by a big margin.
Now my GG Revelation is around 400 hours of playing time.I still feel improvement in bass area, but i am not sure if they are still getting better or i'm just more used to their sound.Now i really like these cables.
Anyway, this is the best IC cable i've heard so far.
I intend to keep these.