After reading this thread, I can't find anything said about the GGs that I haven't found to be true for Audio Metallurgy GA-0s, except that I've never heard anyone ever question AM's soundstage, which is truly amazing. I've actually had to check to see if my wife had surrepticiously switched on surround sound because the some instruments seemed so far past my speakers.
Just before I bought the Audio Metallurgy GA-0s I had a chance to try out used Audioquest Cheetah ICs and balanced Audioquest Hawk digital ICs someone was selling locally here. Even used the owner wanted a bit of cash, cash which I hoped to invest in a balanced power conditioner. Yet I really liked the idea of the battery in the Cheetahs to help overcome the effects of insulation. And then I read of Audio Metallurgy's design with magnets . . . I could see right away it was a better idea (in concept at least if not in reality).
The Audioquest Cheetah/Hawk ICs were hands down the best I'd ever heard in my system, though just a tad forward for my tastes. Yet, because I could try out the Audio Metallurgy GA-0s for about $300 (acquired at Audoigon auctions), if they worked I would still have enough for that BPT conditioner I wanted. So I bought the GA-0s.
It took about 10 hours for me to decide I liked the Audio Metallurgy GA-0s at least as much as the Audioquest ICs, and another three days of break in to like them better. The highs were almost equal in detail but without the edge of the Cheetahs, and the midrange was far better. As a whole, the sound seemed more integrated, very natural and at ease, with the sound stage seeming to leap out effortlessly. Bass extension was excellent, with punch and musicality. Maybe Audio Metallurgy should consider patenting their design because I suspect that that huge sound stage is a direct result of the magnetic technology.
I believe the Audio Metallurgy GA-0s must be the best bargain going for ICs (and no, I have absolutely no interest in AM other than what they can do for my system -- McCormack, Proceed, Genesis, Legacy components -- but I admit I am writing this out of gratitude to AM for providing such an awesome product at such a great price). In fact, I have wondered if the bargain aspect is keeping people from trying them.
Are they better than Gabrial Gold ICs? I can't afford to find out (I am ordering the BP-2 conditioner today!! . . . another audiophile bargain?), but I'd love to hear from someone who has tried both comment because it would be good to know if one can cable one's system for hundreds of dollars just as well or better than one might spend thousands to do.