I'm seeing some chatter about how you can't build a PC with equivalent performance and features for the same money.
Now, this appears to be on-the-face-of-it true. However, one thing that needs to be borne in mind is that Apple don't pay the same prices as we do for components, even when we're shopping at NewEgg and getting things cheap.
They pay less. A LOT less. We don't know what Apple pay AMD for D700 GPUs, nor do we know what they pay Intel for E5 Xeons, but you can bet your last Rolo that when Apple take £4000 off you, they didn't just spend £4500 to do it.
And these components are all brand shiny new - in six months, the Mac Pro spec will be the same as it is today, yet the components required will have become cheaper at retail.
Interesting and thoughtful critique at Engadget: