Last time I had something like this, the archival inks were stupid expensive (and DRM'd BTW); and if you didn't print often, you would waste a substantial amount of it cleaning the print head. Have things changed any?
Back then, the reality was I could order better prints from Apple for less money than just the paper and ink costs. So for those who have these, is it just for the instant gratification 'one off'? Are they really good enough for proofing?
Considering the deal, but just being cautious,
-SiP