I use the canned color profiles from Epson for VFA (awesome paper) and the results are excellent. On the color side, it appears Epson has done a fine job with profiles - for THEIR papers for the 3800. I also use Eric's ABW profiles for VFA and a variety of other papers and the output is head & shoulders above using factor color profiles and printing using ABW - as good as ABW is.
I also recently bought a color profile from Eric for IGFS and the improvement over the stock Ilford profile was startling. I've yet to see a factory non-Epson paper profile for the 3800 deliver anything resembling impressive results. Muted colors, too little/too much ink, too much impact of paper color on print colors, etc, etc. The ONLY exception so far (for me) is the (free) PixelGenius color profile for Epson's Exh Fibre - excellent.
I WILL be buying more profiles from Eric. Great service, great output, and at the price, virtually a no-brainer.