I learned something today when I took my iPhone 4 (flaky home button) to the Apple Genius Bar today. Meeting for appointments no longer take place at the “bar” itself. This was, at least, the case for my iPhone. We just stood in on the store floor while the Genius (Sean) diagnosed my problem, determined that the device was still covered by an extended Apple Care warranty, and went to get a replacement device (refurbished iPhone 4).