I have a set of ADK A51S LEs (Type IV). JasonB. used to have a set of A51S (Type V) I think, and Brian Costigan used to own a set of A51S LEs (Type VI). The new LE sets, the Hamburgs and the Viennas are (from what I gathered) basically "warm" and "pres" mods of the Type VIs.
I'm not sure of the SD ADKs, they have not been too highly recommended by JP, but he says he is wokrng on it.
As for my mics. I LOVE them, although I'd be willing to trade them for another set of ADKs of some sort...
Jason B. is a big ADK fluffer, although he went U89 and MG recently...
Terry