I did use a grey card today for the first time. With the valeo I just didn´t need it. I played a bit with the color temperature and tint slider and it just snapped in oviously, what was the right setting.
With the H3D I tried it manually, but I always had the impression something was wrong.
Using the gray card for the first time was interesting. I looked a the picture in Flexcolor and thought: aha, that´s the correct setting. Mostly it was way to warm. The skin tones are still too red. One of the pictures became beautiful after adding a curve, but the others still lacked something.
I think the general color rendition sucks. I made a comparision with files of my 5D when ARC 4 came out: In the background of a setting were some unimportant things, out of focus. In the file processed with C1pro everything had a pale greyish tint, undistiguishable from each other, unattractive. When I processed the same raw file with ACR 4 colors showed up: what formerly was just one greyish mud turned out to be an intensivly blue window grill in front of a yellow wall. I don´t talk about any oversaturated effects but there were just colors that weren`t there with C1pro, with a very natural appearance. I think the H3D and Flexcolor have the same problem. OK, it is better than a 5D with C1pro, but the colors don´t stand out as clearly as, lets say a Leaf back, a simple Nikon (hello D70), or my 5D in ACR 4.
I hope that Hasselblad will invest a bit of development here. My own experience with my 5D shows that improved software can get very different results from the same hardware.
Bernd