I spec'd this mic after not finding any LDC's under $2000 that I considered to be worthwhile. Retail price is $1000.
AEA has various ribbons optimized for close, medium, and far micing. This one is medium. It works well on a wide variety of sources.
Great on acoustic guitar. EXPENSIVE sounding. Also great on vocals. Big lows and plenty of highs with the application of some high shelf EQ.
Due the the ribbon's geometry, it has an off-axis HF rolloff in the vertical plane, but no roll-off in the horizontal plane. This can be very useful. I used it as a mono drum OH. I oriented it lengthwise so the null was aimed toward the crash cymbals, while the ride and hat were attenuated by the HF rolloff. It picked up a perfect balance of the entire kit including the kick drum, with a huge tom sound. Astonishing.
Haven't tried it on guitar amp yet, I'll report when I do.
It's a large ribbon tensioned so that the resonant frequency is below 20 Hz. No weird resonances, definitely the smoothest and most neutral of any of our mics. AEA definitely knows how to make proper ribbon mics.
I couldn't figure out the reason for the captive cable, then I realized it's so the mic moves properly on its shockmount. A Shure SM5b has the same thing, except it's a shorter cable leading to a male XLR jack on the shockmount.