Joe:
I'm an Owner/Operator with FedEx Custom Critical so my opinion is considered biased by some. Other O/O's will tell you the same about their respective companies.
My carrier keeps us as busy as we need to be, particularly during the busy times. We get paid better per mile than the expediting industry norms. We have fewer deadhead miles than the average. And, we have more smiles per mile than any other drivers.
Joe, those are the basics. The details you seek are, as Lawrence stated, contained in the recent archives. My sincere suggestion is you contact a few of the recruiters linked to this web site, talk to them about your goals and ambitions. Learn a bit more about this business, then research the archives here for candid comments from drivers from many different carriers. After that, any one of us will answer, in detail, any questiuons you then might have.
I hope I don't come across as sarcastic; but, I've seen too many good folks lose all they had because they invested in equipment they could not afford and tried to run a business for which they were ill equipped.
Best wishes, Terry