Yes I have - Pete Best book is told from his perspective, it's pretty slim (192 pages) - I would take anything he says with a pinch of salt, but it is good to read about the Hamburg days from someone who was in the trenches (so to speak)
The Kevin Howlett book is more of a factual diary type deal, there are some photos from sessions, as well as reproductions interdepartmental letters, pages from Radio Times. It also lists any non-music stuff the band did with the BBC (Kenny Everett, David Wigg)
Sean Egan book is good from a perspective of bringing together old articles published on the band by newspapers of the time.
Hey Sir John....have you read those three books you posted?