Many, many moons ago I was getting fabulously drunk with a guy from Yip Chun's lineage, who said that Yip Chun had no recollection of his father giving private lessons to Leung Ting, and that LT's accounts of those lessons sounded false (the format of teaching).
A few years back Duncan Leung talked about his private lessons with Yip Man - saying that lessons were a few times a week, consisted of one hour of direct instruction, followed by Yip Man then hanging around for another hour or so to smoke and drink tea while correcting (verbally) the forms, dummy work, weapons work Duncan Leung was practicing while Yip Man watched. He also spoke of regularly meeting Yip Man for tea and dim sum - occasions when Yip Man would talk about Wing Chun (history, theories, general stories, etc)..... exactly the lesson and learning format that Leung Ting had also been talking about for years.
Regarding PB, all you really need to know is that:
a) he looks very skilled
b) he takes his training very seriously, by all accounts
c) some of his students have been brainwashed and would drink goat's blood if he gave it to them