As we just passed the 2 week mark since release, I am enjoying my Xbox One even more than I thought I would. It definitely is getting a lot more use than any of my previous systems 2 weeks in and I am an older gamer and had a 2600 back in the day...lol.
My fiancée loves it and uses it a lot as well, she loves how Kinect works and uses the Fitness programs every other day.
Still a lot of work they need to do on it though. With the amount of CPU/GPU resources and 3gb of RAM, the UI should be quicker and moving from apps to apps should be a little quicker too. Not that it is bad, but very obvious that they muscled there way to get something stable ready for launch.
I just hope we get an update, even a small one to help improve things would be nice, especially something to help improve load times, which are incredibly slow as in game installing. I am pretty sure that this is OS related and hope some improvements are coming soon.