In short: it's awesome; the best stand I have ever used, by a wide margin. Read on for details.
The Roost is an ingeniously designed laptop stand that folds away to nothing, so you can always carry it with you. It's another Kickstarter success story. (It's the third I've participated in, after the Elevate iPhone dock and the Pebble watch. I absolutely love the Kickstarter economy.)
Here's a picture of the Roost in its carry bag. You can see that it's just tiny:
And yet for all its diminutive size, this stand gives my laptop wicked air:
The laptop screen actually sits higher (closer to eye level) than on other stands I've used from Griffin or Xbrand, despite the Roost being much lighter and smaller. Folding and unfolding the Roost is fantastically easy, smooth, and fast. It's just excellent design.
The laptop is held up by two tiny tabs that latch underneath the display's hinge:
If you're at all thinking about purchasing a laptop stand, I can't recommend the Roost highly enough. Buy it now.