I've never had a cibachrome made from any of my personal film, but I've seen them ,and when properly done (masking is usually needed), they're STUNNING!!!!
I used to work for a prominent camera store here in LA, and I sold some 4x5 FP4+ to the guy from Lab Ciba. I asked him if he could show an example some time of an ilfochrome, since I'd never seen one in person up until that point, he actually had a test print he was running to a client after buying the film(for making masks). He went out to his car, retrieved the print (was a pano of bamboo, big chutes, and was about 2.5'x5'. I believe he said it was from a 4x10 Velvia transparency. All I can say though, is, even with the crappy store lighting that I saw it in, it had a glow that I've never seen again since that moment. Every little nick in the wood was in super sharp detail, and I looked at this print from like 9" away. I examined this thing close, believe me .
Even if the rating is 29 years( I wouldn't display it). I'd rather have that print mounted to aluminum, and in an archival solander box or flat file.
different strokes for different folks, but I've seen some 8x10 transparencies(not mine) when picking up my E-6 from the lab, and they're glorious!!!!!
I have an IPF5100, and according to the ratings tests, my printer with good paper should last 100-200 years in proper dark storage.
I'm not a "show it off" person, I prefer to store in a dark, cool place where I can enjoy it, without worrying about damage from excessive exposure to dust, bad air, etc....