Someone I know is selling a AKG D12e from the 60's/70's with the original box in great condition.

I don't know much about it since they aren't made anymore. Tell me everything and everything about them, what style they're for, reviews, critiques, ups/downs...everything and anything about this mic.

I'm currently deciding on either buying a RE-20, SM7,AE2500, or a D6. I've used every mic (and some I left out such as a D112 which I hate the sound of) I listed except for the AE2500 which is a new mic AT made which is a dynamic and a condenser mic housed in one body as a daul element kick drum mic. Has anyone used this mic yet and what was your response.