I agree that the damn software is irrelevant. If it displays the question stem, the choices, some sort of clock and it allows you to click on the answer - that's that, all I need. There may some additional features that are weird, yet simple (such as being able to make chunks of text disappear, marking 'unsure' items etc), but who cares?
One issue I am interested in though: in the test center nearest to me, they have these crappy display screens that use an unbelievably low refresh rate. Is it the same everywhere? Doesn't Prometric make enough doe to buy some low end Korean TFTs? I donno, but I guess one of the real problems I will face could be related to the horrible headache and my sight blurring out.