I wanted something basic, but this is more basic than I expected. There is a U-shaped metal bar that supports the stand, lifting the top piece up from the bottom. Although there are two slots for it to go in (only), the slots are just an inch or so apart, meaning they are about the same height. The angle of the laptop goes from shallow to slightly shallower.
The description said that it's made for up to 17" laptops. Well, my 17" MacBook Pro is mighty wobbly, and I have to slide the computer down toward me so that the front is sitting on the table top, thereby preventing it from rocking even with normal typing. As a result, I also don't get any height adjustment to the front of the machine, and have about six or seven inches of stand sticking out behind my computer. Now that I look at the product photo again, their computer is slid down on the stand, as well.
The steeper angle is not terrible, but I'd like it steeper, and I've half a mind to chop off the useless back third of the stand with my jigsaw so that it won't take up so much space in my drawer. If I'd bought this locally I'd return it and get something more flexible and more compact.