thanks guys. i ended up ordering it a couple days after i started this thread. so far, i've shot three boxes of polaroid films though it. one box of polaroid black and white, and two boxes of fuji 100C color. it works pretty flawlessly. although, i kept forgetting to remove the darkslide, because the pro-s backs wont allow me to shoot with it in, but the polaroid back doesnt have that feature.
yeah, and to remove it you just pull the lever at the bottom of the camera.
thanks again.