I rate the credibility of this story well above bigfoot but well below the aliens inviting us for dinner. These men appear to be detailing their honest memories of whatever it is they encountered. However their memories of the abduction were stimulated by "regression hypnosis therapy" which, as Grothesk can tell you, is somewhat controversial. I guess what lends them some credibility is that under hypnosis they all remembered similar details - that could just mean similar details were suggested/implanted wittingly or unwittingly by the person who conducted the hypnosis regression.
Rare/Interesting Abduction Story