This is the second of these wonderful panel heaters I have purchased. The first one lasted nearly ten years before it finally couldn't hang together anymore.  I like it, but my pets absolutely love it!  The heater provides a comfortable and safe heat from both sides, with a great tip-over automatic shut off feature which is critical to not only the safety of my critters but to me and my home, too.  I did have to replace the feet on my first heater after several years, as the plastic got really brittle, but the little heater just kept on heating.  The photo attached was taken toward the end of my first heater's life.  The bricks in the photo were there to help support the heater as well as to keep the beds from touching the unit with the added feature of storing and radiating a bit of extra heat.