Almost every review for this and the SII mentions the "cheap" and "flimsy" backplate. Have you seen this video of it getting folded in half and being entirely undamaged?

http://www.youtube.com/watch?v=ErXqnQKs-tA

I've not actually tried it because the video shows a Galaxy S II rather than the Nexus, but it's given me a lot more faith in Samsung's "cheap" plastics.