No regrets with the XBox One. Games are very good and will only get better over the coming years, I like the Kinect functionality and I am looking forward to how that develops, the controller is light years ahead of my old PS3's controller, but then again a turd with buttons and sticks would be and overall it's mostly positives.
Not a big fan of the interface, I had a Windows 8 phone I had to get rid of very quickly as I hated the interface, but it does the job and I can live with it.
I will get the PS4 when a game comes out I must have, Uncharted or some other game I am not aware of yet, and I fully expect to be happy with that from what others have said.