Red River has been supplying paper to me for several years. My old favorite is Ultra Pro Satin (since version 2.0), and I have used early Greenpix, early San Gabriel baryta (new favorite), current Aurora Natural, and various mattes and glossies in two sampler packs. Palo Duro softgloss rag and some large sheets of 32 lb matte are incoming.
The samplers have been a great way to learn about the variety of papers available in the whole market and to experiment. I print on Canon and HP non-specialty inkjets and recently acquired a Canon Pro-100. My printer refurbishing work, 100-150/year to sell by a nonprofit, also gives me access to Epson photo printers -- if by chance they can be unclogged, it is fun to try Red River sampler sheets in them.
The greatly varied papers in Red River's samplers all work very nicely in the Pro-100 and the majority are fine in the lesser Canon and HP printers. Red River's ICC profiles recently began to help me to take best advantage of the papers. Red River's website contains many informative articles that point me in constructive directions to help with my refurbing and own printing. An emailed offer of photo cards let to a sampler that made me switch my winter holiday cards from purchased ones to custom ones with my own landscape cover photos. In general Red River transformed my printing habit from frequent amateurish using printer OEM paper scraps, to improving enthusiast matching paper type to image content. And I can afford my habit much better than if I were using certain European or Utah inkjet papers. Red River puts it all together from paper to advice to support. Many thanks to Drew and colleagues for lifting me to a higher level of print literacy and quality!