I had to return my Speck cases for my two Macbook Airs (2010 and 2011) three times in less than 6 months (one twice). The corner edges of the base (closest to the esc and power keys) have cracked on the three I returned and the current one (so now four). Only one of the cases (two weeks old) has not cracked yet. No, I have not dropped the Macs, and they all sit at home in my house so they are not even lugged around. The cracks start like stress cracks and after a few weeks they start to break. The Apple store has been reasonably ok to replace them, although the one I replaced twice required some polite persuasion. I am worried about taking the other back the second time now. Does anyone have any suggestions on a shell style case similar to Speck that does not crack? Or at least last a reasonable time. I don't mind if it is a touch thicker, just as long as it is not so brittle. I have seen that Moshi and Incipio make similar cases, but was wondering on peoples views from experience. EDIT: Sorry, probably should have put the thread in buying tips.