This is exciting! I have decided on the iMac G5 to be my first Mac, and by the looks of it, it may be a birthday gift (october)! But some questions on that Screen Spanning Hack: 1) Is it 100% reversable? Like, if installed, can I remove it? 2) Will it void warranty? 3) Is it compatible with the Rev. B iMac G5s? 4) Does anyone here use it and have any comments? Thanks!