Gabriel Gold IC's are they really this good?

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.

audiobb- I concur that the cables do take a bit of time to break-in ,however,I never found them bright or to be light in the bass even in their infancy.I also concur easily the best cables I also ever owned.

The cables really take about 250-300 to fully break-in.
The cables do experience sonic changes at about 40/100 and 150,however at about 300 hours you have EUPHORIA

What actually is changing from 150 to 300 hours? Are we talking tonality changes as in a more linear tonal response or simply a more extended frequency extremes, or .......... some other sonic attributes?

There's a lot of discussion on tonality here. This was not much of an issue for me at 0 hours or at 155 hours. Tonality was nearly identical to the Jade Hybrid except for a little bit of bass shyness in the GG Rev. I too never heard any hint of brightness with the GG Rev when used between the Aesthetix Callisto, CAT JL-3 and APL Denon tube CDP products.

What about dimensionality, decays, harmonic structures here? And I do not mean in absolute terms but relative to how the cables were from the start AND directly compared to other cables swapped in and out right then and there. I heard absolutely no improvement here from 0 to 150 hours. Are there any significant improvements in these areas at the 150-300 hours? And did anyone have a reference cable whose strengths excelled in these areas to compare back and forth with the GG Rev's during their burn-in process?

Soundstage,depth of field,height of stage,detail,bass and even greater tonality and textures which these cables are becoming famous for occur after the 300 hour mark.As I initially stated when I started this thread I was comparing the GG Extremes to both the Stealth Indra and Siltech Forbes Lake which are both what I call pretty decent reference cables.I liked the Gabriel's better.The Revelations definately take longer to burn in but once they do LOOK OUT ! it becomes NO CONTEST.
I've read a lot of Steve's feedback (sts) and many members love the sound of the Revelations right out of the box.I'm sure once they break in they must be gushing with greater appreciation.

"I've read a lot of Steve's feedback (sts) and many members love the sound of the Revelations right out of the box. I'm sure once they break in they must be gushing with greater appreciation."

Yep.