We have a new I Mac, as of January 1/2010, airport card, replaced, super drive replaced, and now it has slowed down booting, so Mac's are not without problems, I'm glad we took the longest warranty out on it. Now the repair people were here is less than 6 hours and back again 24 hours and again 24 hours later and since we worked with the apple rep on the phone the repair service had the parts quickly, The repairmen do not work for Apple directly, but subcontractors for them. He knew only what a training program was for repair taught him, but he was good at what he knew, basically they just replace parts that are or appear to be bad. He did know something abut Macs software and had some supplied diagnostic programs with him