I have a spec for my mbp and it did cause some scratches on the front edge of my computer. They are minor though, and barely noticeable. I think he problem was particulates getting pushed down between the mac and the case. The rest of my computer though is fine. One other thing I noticed about the spec is, although it feels quite light by itself, once the case is on your mac, the mac seems a noticeably heavier. Still, I like my spec, it prevents dings to my aluminum, but I suspect that isn't an issue with a plastic macbook. If you are looking for scratch protection only, I'd go with one of the film type solutions.