Amazingly light! The alloy felt thin, but it heats up very well. The entire thing is large enough for 2 dishes or foil pans (or a combo of both), but still pretty compact and thin. But the most surprising thing was how light it was for its size. Seriously, I have no trouble lifting this with just my thumb and index finger (like pinching) and running a mile with it; that is how light it is! The warming tray is stupidly simple to operate too. There's nothing complicated about it at all. It's just simply plug it in and turn the temperature dial from min to max! The light on it indicates whether the device is in active-heating-mode. When the light is off, it means that it's achieved the desired temperature as set by the temperature dial and will maintain it at that temperature (so, you will see the light turn on once in a while). Although, there is no power off feature except for unplugging the cable. The surface is also really easy to clean with just wiping off after the tray cools down. The large handles on the side make this easy to carry.
How great this is for our potlucks! Because it's so light, I would even bring it with me to other people's home for potlucks and use it there. It works really well, and it's better with one of these than without it. I've tested it with a casserole glass plate and a foil pan, both with water at temperatures of 117F, and set at the max temperature setting on the temperature dial. At about an hour later, the casserole glass plate dropped down to only 115F, whereas the foil pan (with more water in it actually) dropped down to 113F. It's great presentation and keeps the food warm for extended periods of time.
Really like this warming tray. It's just so thin, compact, and light, that I find myself using it for any reason I can find because it's so convenient.