You're right, Karin, I was a bit too harsh on my previous post regarding Mr. Gamblin (I guess some general anger was manifesting itself here...!)...
Many of their products are great--their Transparent Earth Yellow is marvelous--like a classical Indian yellow, and it makes the most wonderful greens (ala Vermeer) when glazed over Ultramarine blue. I also am a big fan of their PVA size.
I do wish that Gamblin would get more specific about their pigments/hues. Many of the European manufacturers (who seem to me much more "classic" oriented about pigments and hue names) also make the same mustard-ish Naples yellow that Gamblin makes, but they all call it "Naples Yellow Dark"; I think such definations are most helpful to me when I am purchasing paints.