I have one. They can be very hard on sprocket holes! Just wind on until it stops and don't force it farther. Also, the shutter arms when winding and won't arm if there's no film in it. The shutter also won't arm if the film is not wound far enough to the next frame. The f-stop and shutter speeds are linked, you can't chose one independently over the other, so just use the little symbols for setting exposure. They feel like cheap plastic, and I kept expecting mine to break, but it hasn't yet.