I make my living with a guitar in my hands, and this pickup is simply great! I've used it for several years now, in a variety of rooms and situations, and it always delivers realistic acoustic tone. With the blend control, you can pretty easily deal with feedback if the acoustics of the room aren't optimum. The more of the mic that you can dial in, the better, in large areas, but even the magnetic pickup alone is leagues ahead of all the other acoustic pickups I've used. Top of the line Martin and Taylor on-board systems included. The mic placement/adjustment inside the guitar is hugely influential. You really have to take some time to find the sweet spot in whichever guitar you mount it in, but again, used in conjunction with the blend control, it's not hard to find a really nice sound. I've never had any problem with the mic moving around.