I think you can get an idea what the Piezo prints look like from the
samples but they're pretty small. I bought them and it didn't
convince me to invest in the system. I settled on the UltraTone ink
and Paul Roarks's Curves for right now.
You're right, though, It's hard to find full size prints using any
of the methods. You really need to be near a large metropolitan
area. I'm in the San Francisco Bay Area and exhibits of inkjet
archival prints are few and far between. When you do see a few,
however, by folks who know what they're doing it will take your
breath away.
Tom