I don't see many comments about Epson papers.
What's your point? What's your question? Which paper?
Both Luster and Exhibition Fiber are very good papers...the newer hot/cold with and without OBAs paper is very good for watercolor papers. Each paper (regardless of the manufacturer) will have it's strengths and weaknesses...lot of people flail about trying to find the "perfect paper" and never really get good at using the paper they have.
Lot's of things to consider when choosing papers...D-Max, OBA's, roll/sheet, look and feel...you should use what makes you happy (regardless of who "makes it").
Fact is, most people have no clue about the paper industry...very few paper makers, very few real options, lots of marketing hype. Some papers have really good quality control sheet to sheet or roll to roll. Some makers, not so much. One package may be good, the next may suck because of irregularities.
Long term, it's prolly better to settles of a relatively few papers that you can achieve the quality and consistency you desire and expect. Constantly switching papers will only confuse the issue of what sort of print are you demanding (or expecting)?
Day in and day out, I really like Epson papers (for the ones I use). Yes, I have a relationship with Epson...so? There's a reason I have that relationship–their shyte ain't bad (meaning I like it).