I just purchased a Canon Pixma pro100 and got both Semi Gloss and Luster paper as gifts-with-purchase... to my eye, the papers are nearly identical. Luster has a slightly duller finish than Semi Gloss, which isnt really glossy at all -- both have a gorgeous, almost pearly finish. And the print quality is simply STUNNING. I typically only print my work on cotton Matte papers, but based on the quality of this paper I may just change that.