While the stand folds down, its definition of portable may not be the same as yours. The stand weighs 1.9 pounds, and its desktop footprint is 10.5x14 inches, with a folded thickness of 1.25 inches. That means you're going to need a pretty big shoulder bag to carry this around with you. Still, finding a laptop stand that works well for larger laptops is rare. That's a shame, as big, bulky 17-inch desktop-replacement laptops that stay rooted in one place very often can benefit from a more ergonomic angle (and extra cooling help). I found a 15-inch laptop matched up almost exactly with the edges of the stand, so a 17-inch desktop replacement will spill over a bit, but not enough to be unstable.
The design is inoffensive but forgettable. Light-gray plastic is offset by dark-gray gabardine padding that covers almost the entire bottom surface, and forms a padded border around the fan grate on the top surface. A USB cable, to power the dual fans inside the stand, sticks out from the left side, but can be tucked inside to stay out of the way.
There are no controls for the fans: they're USB-powered only, and either both on or both off. The fans blow air up onto the bottom panel of your laptop, rather than sucking hot air away, as some laptop cooling gadgets do. While the fans make an audible whir, I've certainly heard louder internal fans in some laptops. If you choose to tuck the USB cable away and not turn the fans on, just having the laptop elevated will create an air channel under it and aid with cooling a bit.
A laptop stand can easily be generic, so it's nice to see an occasional example that does something different. I liked the Cryo E40's metal construction better, but it's for smaller laptops only. The Targus Space Saving Lap Chill Mat has a couple of unique advantages -- it can accommodate larger laptops, and it's reasonably portable. If you need a laptop stand that hits both those marks, this one is for you.