He will have zero regrets.
He's getting minutes in the best league in the world, whilst getting paid the most he's ever had.
Worse case is, Ipswich get relegated and he's back in the same division where he was a year ago, but on much more money (even if he does have a relegation clause).
He would have been seriously crazy to reject Ipswich for another season in the Championship.
Personally, I don't think he's ever been good enough for the PL, but he had to take the offer. Who's to say that offer would have come again.
A footballer is literally, potentially, one match/injury away from never playing again.
Take the bag and run.