I've got the Invisible Shield on my 3rd Gen, and I am fairly pleased with it. Dropped it once from four feet onto concrete, face down, and it came back up without a single scratch. It really does the trick. Although, as aforementioned, dust builds up on the edges, and sometimes even embeds itself into the screen, which really frustrates me. Plus, the shield doesn't do well on the curved edges; it's been peeling for a while now. But, when you have the employee at the booth install it for you, they'll replace it for free once, so I suppose it's still worth it.
