I'm just noticing this thread now. Have been a bit off-line lately. PEM and all.
I have been a patient of Dr. Hyde's for the past 2 years and have had a very good experience with him. His specialty is, and he doesn't claim otherwise, ruling out all sorts of possible other diagnoses that could mimic ME/CFS. One of his latest books I believe is called Missed Diagnoses and in it he explains all the other possible common and rare diseases that one could have without knowing it mostly because doctors are not doing a very good job of examining patients and ruling things out.
Since seeing Dr. Hyde I have had a massive amount of test procedures which, because I live in Ontario (the province in which he practices) are covered under our health care provider OHIP. If you don't live here I would imagine these tests would be extremely expensive and in some countries, nearly impossible to obtain.
Dr. Hyde is excellent, as someone else mentioned, at sorting out disability and medical insurance papers.
The area in which I have reached a dead end with him is that of treatment. This, of course isn't really his fault since there isn't any definitive treatment for ME/CFS yet. The only treatment I get is for individual problems that go along with ME/CFS, migraines for example, and then that is provided for by the doctor that Dr. Hyde has referred me to ( and he has referred me to many).
PM me if you have any more questions.