There's a discussion going on right now on another forum about superusers at Pitbull, sounds like it could be legit. I've never had a problem there, including cashouts, but then again I only play tourneys.
The apparent superusers were supposedly at the higher stakes cash games. The main poster at the other forum has been trying to talk them into sending his own hand histories for the last 1,000 hands and PB won't do it.
Up until yesterday, he was able to retrieve the HH's from the website, but not in a usable format to prove or disprove anything. Now, he claims, none of his HH's are available. He was in the process of getting help in turning theses HH's into something that could be added to a spreadsheet or database when PB supposedly pulled the plug out.