Taking a practical look at the different elements of the smartphone and how well they interact with each other, Day breaks down his experience in the article around how he uses the phone day to day. Overall he seems pretty pleased with Nokia's first Windows Phone:
What works for me may not be the way at all for someone else, so the user component remains a big question mark. However, this is not dismiss the level of attention from Microsoft and Nokia on the trying to give me various avenues to accomplish the same thing and not getting in the way of allowing me to define my own way to work. They seem to have adopted this principle and so questions of my ability and strange likes and dislikes aside they have addressed many aspects of the suer side very well. The hardware and software are very closely linked and so I make it a point to identify this discussion as pertaining to the particular hardware and software that I am using.
He's still using the Lumia, and at the self-proclaimed mid point of the experiment, he's not ready to move back to his iPhone. Follow the adventure on his blog.