Agreed. Apple has replaced two logic boards in an old MBP (one for bad video card and one for fried firmware), the drives in my iMacs and swapped out a faulty power supply for an old Mini. I've found that if you're polite and competent the Geniuses will help you out. Doing some preemptive research and work like making sure you have backups, etc also goes a long way to ensuring a smooth experience.