Having processed thousands of NEFs using each converter, my comments are based on a general impression of the overall performance of each.
And this particular image is representative of the best each is capable of, given the limitations of the photo (taken at ISO 640, the threshhold at which D2H noise becomes a problem). This is typical of how I use the D2H, between ISO 400-1600, rarely at 200 other than the first several weeks after I got the camera.
While I could add some clarification to my comments attached to each image by adding the above information, I'm not sure that anything else is necessary.
For one thing, it's up to each photographer to evaluate software based on individual needs and with consideration to the type of camera used and how the camera is used (optimal ISO vs. high ISO; type of subject; typical lighting; etc.).
My observations are based on my photos and my working style with each program. While I can't predict how others will evaluate these programs I'd be very surprised if other D2H users who shoot at ISO 400 and above see significantly different results from mine.
However, I'm not making a definitive statement about the performance of each program. It's merely a starting point for evaluation and discussion. If I wanted to make an inarguable case I'd provide specific methodology that each person could copy to confirm or refute my findings.
But, again, I don't believe this is necessary. These results are representative of each program. In every case, Nikon's own RAW converter has been better than everything else I've tried, altho' Photoshop Elements 3 and Bibble Pro were very close - close enough to make little difference for most users.
And in every case, no matter how many variations of adjustments I tried with RawShooter, the problems stated *always* were present: ugly artifacts and exaggeration of ruddiness in skin colors ... with Nikon D2H NEFs. Name a permutation, I've tried it, several times. If you read back several months my first impressions of RawShooter Essentials 2005 were quite favorable. But after literally thousands upon thousands of tries, I'm confident that my results can be replicated by anyone with a D2H.
Finally, my emphasis is on the quality of the basic NEF rendering and conversion, *not* on color correction, adjustments to contrast, brightness, gamma, curves, levels, etc., and not on noise handling or sharpening. In many cases I've used Nikon software only to convert NEFs to TIFFs with absolutely no further adjustments made in Nikon software. The results are consistent. Ditto RawShooter, altho' due to the number of adjustments made by default with RawShooter it's necessary to conduct far more experiments to reach any conclusion.
This is why I waited several months to offer conclusions and opinions. I'd actually created the folder for those sample images weeks ago, but decided to run some more experiments before uploading any examples. I wanted to be as fair as possible to Pixmantec's software, including trying RawShooter Premium. And when I learned they'd updated the freebie Essentials (version 2006) I wanted to give it one more try.
Admittedly, my expectations for Irfanview conversions was low because I consider RAW conversion an incidental benefit, not the primary purpose of Irfanview. And I was tougher on RawShooter because it's entire purpose rests exclusively on a single task - converting RAW files.