Having recently acquired an Epson R1900, I have to say I'm not happy at all with Epson's ICC profiles for their Ultra Premium Photo Paper Luster.  I'm used to Epson's profiles (from their site) working pretty well but their Ultra Premium Photo Paper Luster profiles for the R1900 produce prints that are too dark using the v6.61 Windows 7 drivers.  I've created my own ICC profile for Ultra Premium Photo Paper Luster using Qimage and Profile Prism.  For R1900 owners who are interested, you can get the profile free here:

http://www.ddisoftware.com/profiles/R1900-UPPPL-BP.zip

Feedback here is welcome!

Regards,
Mike