I wasn't expecting this to be great quality because it's pretty cheap. However, it's much better than I expected.
It's lightweight and easy to carry/store. I don't know how other people will be using this, but I taped mine to my laptop, so I could view an image through the circle and draw it proportionally. Because it's so lightweight, it didn't budge, even with only one piece of tape.
It's also really easy to trace. The only drawing errors I've made while using it have been purely my fault. I highly recommend this product.
Edit: I forgot to mention, it has tiny projections on the back. I left a picture to show what I'm talking about. But they allow you to trace without the whole stencil laying on your drawing. That way, your work doesn't smear. I love that feature!