I've tested and used Premier Photo Luster on my Z3100, but haven't tried any other brands. I like the overall quality the Premier gives me, but I've been seeing a manufacturing problem with the Premier Photo Luster where the paper has a rippling pattern visible at certain reflection angles, so I'm thinking about switching to another brand of luster. None of my clients have noticed this, but it really drives me nuts.
I don't use luster a great deal so I'm not anxious to waste a lot of money testing the different brands out without a little better knowledge on what others have been using and seeing.
If you've tried other brands of Luster paper on this printer, I'd like to hear your opinion.