I also have the carbon fiber skin and I'm loving it. What I did though is just chose the option to do the back only, as I already have a clear screen protector on the front. Getting just the back is only like $10 I believe. Still covers the side of the phone as well as the whole back. Looks great.
Obviously a skin isn't gonna protect your phone from a drop or something like that, but it does do a great job of protecting it from everyday scratches and things like that.