I use RR UltraPro Glossy, and am very happy with it. Price/quality ratio is excellent, and they serve very well in everyday use. I ordered a sampler from Hahnemühle and some other company when I got my i9950, but didn't see enough difference to justify the much higher price for other papers - if any difference at all with this printer. I used their own paper profile for the printer, but got much better - excellent - results after I got the paper-printer combination profiled.
I'm sure more critical photographers wouldn't use RR for displaying purposes, but they're Good Enough for my personal use. I will continue using their papers even when I get a high-end pigment photo printer for everything except for hanging on the wall.
I've been in contact with their customer support, and it's freakishly good and flexible if problems with your order occur due to unforeseen circumstances (not their fault).
I haven't tested the 2.0 papers, but will whenever I run out of my current batch.