My 27" iMac, hardly used, started to shut down une...

My 27" iMac, hardly used, started to shut down unexpectantly. It took three visits to the Genius Bar over several months to seemingly resolve the problem - the machine at the moment is working as expected.
The point I want to emphasise is, whilst being frustrated at not having a computer when it was needed and the hassle of getting it into Perth and back, the overall level of service and outcome is really quite outstanding. My Mac was a week or two out of the statutory warranty period but those three visits saw; repartitioning of the HD, install of a new HD and finally replacement of the LCD display panel, logic board and power supply - all at no cost. The discretion in providing an in-warranty approach to the problem, general professionalism of staff and, ultimately, a machine that is now working all adds up to customer satisfaction. Thank you, Apple.