I bought this shell 13 "and 15", for my mother and me and we are both delighted. The cover is simply clipped to perfection on the mac, respects its original design: it is virtually invisible. The material of the shell is quite silky, after 3 months of use, it also seems fairly scratch resistant. Relatively lightweight, it weighs much less than the number of computer shells tried before. The price is higher than for other shells, but corresponds to a higher quality in my opinion too. I recommend /