I'm kind of excited, and kind of scared at the same time. I just ordered the 12"x24" for my 4 foot vision. People on the forum say it will not work becuase it will not fit flat, but Bob at Pro Heat assures me that it does not matter if it is flat or not and will function properly. I just wanted to heat from people who use them what they thought of them and any comments they have about it. One question I have is, how are these panels attached to the inside of the cage? Do they come with some kind of adhesive or do you need to tape them with duct tape or what? I still dont understand how one panel can create a thermal gradient throughout the entire enclosure, anyone want to explain that?