I've been using the RR cards (glossy and matte) for years with excellent results. I have also used their glossy and satin finish papers in 8.5x11, 11x14 and 17x22 sizes over the years. They too are excellent.
I use Colorbyte Image Print Black RIP to print to my P900. They provide their own profiles for all brands of papers. Again, all with excellent results.
For most of my larger printing, I prefer Epson, Carson and Hahnemuhler papers since ICC profiles from Colorbyte make the workflow very easy.
Regards,
Bud James