Mark, that's great if you can get it going for Chromaluxe, but correct me if I'm wrong - Chromaluxe is a dye-sublimation process, whereas a unique feature of BC Allure is that it is inkjet directly printable onto the coated metal sheet if the inkjet printer has a flat media pass-through feed, so different chemistry from Chromaluxe with perhaps completely different fade characteristics. And then, as I mentioned above, just wondering what we could expect the OBAs to fade to, as we are not dealing with a paper substrate. Seems like "uncharted territory". I too hope you can get funded to implement such tests.
The furthest I can go for appreciating factors possibly affecting longevity in a paper product review is to mention whether or not there is an OBA presence based on evidence read off the paper white from the i1Pro2 (which I routinely try to remember to do), but more than that is not my area, and I appreciate the special focus you bring to it.
But getting back to the main lines of this thread, of which OBAs is but one, if I had to summarize in a nutshell what I think of my experience testing it, it would be something like this: without laminating it, expect to see prints that look pretty much like Epson Enhanced Matte prints. The finish and brightness are quite similar, and so are the image properties it displays. Put a nice laminate on it however, and it's really much enhanced by virtue of the improved reflectance; I've seen samples of the same photo in both states (laminated versus non-laminated). But the laminate is another process requiring the right machinery and expertise, which I am informed is expensive, so a job casual users would farm-out rather than do in-house. For those wanting a metal substrate for an inkjet print, the most readily useful alternative that comes to mind is dibond-type mounting, which I reviewed on this website in a dedicated article quite some time ago. Also requires special machinery and expertise, hence one uses a service. With "Dibond", we can print on our favorite papers and get them mounted.
So whether to use the one or the other really boils down to a few key factors: (1) either process means ordering-up part of it from a service provider, (2) which is cheaper, depending on the costs of the Allure panels and the lamination versus the cost of an inkjet print and the "Dibond" mount in one's neighbourhood, (3) whether one values the flexibility of paper types if going the "Dibond" route, (4) what one thinks of the image quality with/without lamination compared with one's favorite inkjet papers, and (5) last but not least, the longevity risk, which until better information becomes available we don't know for Allure, but we do know more or less for standard inkjet papers. So to answer the O/P's question directly: yes, obviously I have, but to recommend Allure over Paper+Mounting on metal, hard to say - as some of the key factors I mention here would vary from place to place and person to person.