I have a Sunpak Polaroid Printer. It was not in great shape when I got it, though a little clean-up helped. Most costly item was replacing the bulb. I would suggest not leaving it on, though leave it plugged in to keep the fan running, then only turn on the bulb just before you need it.
The focus is not super accurate, so sometimes rocking the wheel back and forth a little can get it better in focus. Be sure the slide holder is seated nicely before doing this.
The zoom feature is great for doing crops. It can allow you to make some interesting compositions, if you are doing Polaroid manipulations.
A G Studio