The SF-12 is actually a stereo microphone, and as some people have put it, actually two SF-1's combined. It is a great value for the money, and is a microphone no studio would want to be without.
In my experience of using it, I have found that it sounds great on a variety of instruments. I have used it on drums and the result is stunning; the captured warmth of the SF-12 translates beautifully even through an Mbox! This mic sounds not only great on drums, but on vocals, and guitar. I did some A/B comparisons between the Royer SF-12 and Audio Technica's AT3035, and while the AT3035 is a decent mic, the SF-12 blew it out of the water! The big difference is that the AT3035 has a slight tendency to sound 'tinny,' while the SF-12 sounds big and warm and nice in the lower end. All in all the Royer SF-12 would be a valued treasure to any home or commercial studio.
“I can talk to my Sales Engineer about any piece of equipment, and he always steers me in the right direction. He truly knows what he's talking about, and he never tries to over-sell me on anything. If he worked in the Nashville area, I'd probably owe him about 20 dinners by now!” Michael Erin Woody, Brentwood, TN