My rear "default" protective skin started peeling after about a five or six days of use. On the seventh or eighth day it came completely off. It was fun while it lasted. I noticed that rear skin had the imei number on it.

The front default protective skin is still going strong. At times the + sign will occasionally confuse me as I'll think it's on the screen.

I knew before the N4 arrive that it was prone to sliding so I've generally been treating it well in terms of not leaving on unlevel surfaces. Last night was the biggest drop though. I had the N4 atop a naked iPad and was carrying, tray-like, the iPad to another room (in semi-darkness). All of a suddenly the iPad felt lighter and the N4 hit my foot. Oops.