what are the fault rates of a MBA? and in which component area? i am in the market to buy a base 13" model but an 11" would be fine also. i intend to carry it with me to the university to do some light weight browsing, some light word processing and social networking. every day i would be backing up the documents to my workstation at home. would a MBA last me 4 years without any faults? i have been reading that iMacs get a lot of faults due to the LCD not being sealed and heating problems with HDD, etc. what kind of problems do you guys face? Thanks.