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If Apple slows the MacPro's update cycle down to 18 months they really should have mid-cycle refreshes or price drops.

I think Apple's refurbs sorta fit in that category. When you factor in the refurb upgrade lottery (my recent Hex refurb came with double the advertised memory, an upgraded GPU and a second optical drive) the value proposition can look a lot better, even towards the end of a model's life cycle.
 
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