I dropped my N900 and scratched the back on hard floor within 2 weeks I got it, before I received a case to put it on, so you never knew what would happen.

The N9's OEM case is super nice and color matching, other people won't even know there is a case if you don't say it. And I think the back has enough spacing to protect the lens from scratch unless of course you got something poke onto it.

I wish I could get an aftermarket case fit like that but those from I saw on ebay don't loke like have an exact fit like the OEM.