I'm a novice estate buyer. I've bought estates from SmokingPipes and from a couple of PM members and have had no regrets.
The problem with Fleabay for me is that there are SO many listings, that any money I might theoretically save are more than eaten up by time spent looking. Also, I don't have enough knowledge to know a good deal when I see it.
I buy from the guys here under the assumption that if someone posted a pipe that was significantly over-priced, other members would question it, publicly, loudly and quickly - even if it is another member selling.
I also will buy from those who get consistent kudos from members, e.g., briarblues, walkerbriarworks.
I will probably ask for an inspection period when buying estates. I received one that had a plastic ring that looked silver in the photo. My fault for not researching better - It was very much an impulse buy. I spent no more than five minutes looking at specs before I ordered. It is a Savinelli and it smokes great and the collar is distinctive, though plastic.