I would advise you to use the scope before buying it, to make sure it will do what you want. The SU-232/PAS isn't a "night vision" device like you may be used to. Rather than operating in the near-infrared (0.7-0.9 micron) range like most NVGs, it operates in the longer 7-14 micron wavelengths. Good for detecting body heat, but not as good for using moonlight/starlight to illuminate your surroundings.
Here's a picture taken through the SU-232/PAS:
