I do not know of any prominent, published skeptics who have observed positive experiments.
Steve Jones did experiments, as you noted, but they did not work. Kamikande was a good example. Richard Garwin often attacks cold fusion in public, but when he visited SRI and saw a positive experiment, he agreed it was working in a report he wrote. Nate Hoffman measured helium and agreed it was real. He wrote a book in which he did not mention excess heat results and he claimed that the tritium comes from used CANDU reactor moderator water. He was egged on by people at EPRI who oppose cold fusion. The other prominent skeptics have never seen an experiment as far as I know. Most of them have not read any papers and they know nothing about the research. You can see that from their comments, and in the Wikipedia article. A few of them did read papers. Huizenga and Morrison read papers and attended conferences. Britz has read more papers than anyone other than Storms. There may be a few others, but I don't recall any names. There are not many people actively opposed to cold fusion. There is inchoate opposition in the general population and among scientists. - Jed
