Most of the laptop coolers, stands, and risers we've reviewed have been serviceable, but not always the kind of thing you're likely to use full-time. Some are big and bulky, some only work with certain sizes of laptops, and others are just plain ugly. I first ran across this set of laptop feet, the Just Mobile Lazy Couch, at the MOMA Store in New York, and picked them up on a whim.
Since then, I've used this $19 gadget on various laptops and my iPad, both at home and at the office, and frequently toss them in my shoulder bag along with whatever computing device I'm using that day.
The design feature that helps these laptop feet stand out from similar products, such as theset I reviewed several years ago, is that the two feet can lock together for easy transport and storage. Both Lazy Couch feet are grooved on the bottom, so that the two pieces snap into place, forming a small cylinder. That keeps the two parts together, which is important as they don't attach to either your laptop or table in any way, and makes it less likely you'll lose one (when I looked recently, I was only able to find three out of the original four pieces of the aforementioned Bluelounge Cool Feet set).
When positioned under the rear edge of a laptop, the feet provide 0.7 inch of lift. The angle can be tweaked a tiny bit by moving the feet farther in toward the front. I tried the feet with smaller 13-inch laptops, midsize laptops, and also a 17-inch desktop-replacement laptop. On the biggest, the feet may be too small to make a huge difference ergonomically, but at least the rubber top and bottom surfaces gripped the chassis, and I never felt like it was going to slip.