I have heard rumors about some profile difficulty when trying to create i1 profiles when using various paper mixes because of how Canon handles the "paper type" on the front panel. Is there any truth to this rumor?
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This isn't a rumor, it is a fact. In a nutshell, the problem is that none of the commonly used Media Types for gloss/luster papers allow printing to both the Cassette (paper tray) and the roll. You can use one of the "Special" media types which don't have this limitation, but have their own problems. The Special Media Types don't have Monochrome Photo mode available. Also, in at least one case (Harman Photo Gloss FB Al), one of the Canon Media Types had a larger gamut than Special 5. There are several workarounds to this problem, all of which are annoying, but not necessarily a deal breaker.
This isn't generally a problem for matte papers, because the what is usually the best Media Type--Premium Matte--has Monochrome Photo Mode and allows printing from all 3 paper sources (Cassette, manual top tray, roll).
You can read more about the issue here:
[a href=\"http://canonipf5000.wikispaces.com/Considerations+Before+Buying+This+Printer]http://canonipf5000.wikispaces.com/Conside...ng+This+Printer[/url]
--John