Someone on here said that TPU causes a white streak on the back of an iPod (we are talking specifically the stainless steel iPod touch backing here) over time, and may scuff it. I'm not sure what would cause the white streak, but that sounds more believable than a scuff to the back. TPU is too soft to scuff, right? Only hard plastic will scuff. Anybody here kept an iPod for an extended period of time and only protected it with TPU? How'd it turn out? Mine is scratch free now with TPU, and I'm really wishing I didn't have to return it because cosmetically speaking, it doesn't have any problems.