I love the Epson Ultrasmooth Fine Art paper. I have used it as my paper of choice on my 3800 and loved the rich warmth it brings to black and white prints. I have printed colour on it, and it was fine, but I tend to focus on B&W and I love the warmer tone.
I have heard that Epson was phasing this paper out, perhaps in favour of the new Hot/Cold Pressed line. I am using the Hot Press Natural in my 7890 and, except for a profile concern, it print's great. I recently won in a juried photography show and the judge asked me if my prints were traditional fibre prints. I just smiled and said "no". (Judge was relatively well known Toronto fine art photographer). So, I'm quite sold on the Hot Pressed Natural, which is also slightly warmer in tone than the Bright version.
Hope this helps.