I've been playing on the "hard" setting for a while. I figured they would play better on hard mode, but from what I've seen that's not the case. They still play almost any two cards and make a lot of really bad calls. I just saw the Heavy call an all in bet with an absolutely unwinnable hand on the hard setting. There were three nines on the board, and he had 3 2 in his hand, with no flush draw. There was literally no hand he could possibly be winning against, but he called all-in and just gave away all his chips. I guess it's just bad AI that has him think "oh great I have 3-of-a-kind" even though the 3-of-a-kind is all made up of community cards.
On the other hand, ever since I enabled Hard mode it suddenly seems like they draw out against me constantly. I play poker a lot and I know in poker you can get unlucky sometimes and go on a streak of bad-beats, so maybe it is just a coincidence. But I just turned on hard mode and I see that they aren't playing any smarter and suddenly they're getting lucky against me constantly. It leads me to the ugly conclusion that "hard" mode basically means the computer cheats by giving the opponents the cards they need to make the winning hand more often. That would certainly be easier to program than trying to make the AI smarter.
Has anyone tried hard mode, and what have you noticed different about it?