I can't answer all of your questions but I can help with one or two..
Bob is considered by most to be the father of the tactical knife. His ATCF basically revolutionized the insdustry and to this day is a big seller. Of all the knives I have owned or own the ATCF is still one of my favorites.
His prices are on the higher end of the "bang for your buck" scale but you are also getting more than just a knife when you buy one. I paid $550 for my ATCF which is the most expensive custom I own.
I believe Bob is also one of the first makers to start using a single liner while maintaining knife strength, some one may correct me on this. While I'm not a big fan of any knife with a single liner, he has done well with several models that are configured this way.
I have seen him post here a few times but not in a while. If you do a search for ATCF and look for a thread by "Wire Edge" I think it was, Bob chimed in there about the locks on the ATCF.
Reputation wise he's hard to beat and IMO is one of the classic's in folding knife history. Quality wise he's up there with the best. Fit and finish is great, blade grinds are great, action is great and he has one of the best looking and implemented clips going.
Good luck!
Edited to correct dumb error
