What assurances are there that the house isn't cheating?
The Ultimate Bet / Absolute scandal involved super-user accounts being used to reveal hole-cards of opponents and that most certainly was cheating.
The end result is that room went down in infamy and most of the people associated with it at the highest levels are looked down upon in the poker community.
On the other hand, Poker Stars ended up picking up the tab for Full Tilt, which is now a fairly trustworthy room thanks to Poker Stars' management.