I have both a normal square box calendar and the 2015 round calendar I downloaded from here last year on the wall by my desk at work. The round calendar starts a lot of conversations. I have noted folks in my cube stating that they feel it is easier to follow the year in the round. I have been crossing out the weeks as they go by. This has created a spiral effect thus making it look the the calendar is in motion. All in all, I like it much better. I suppose it will depend on your alignment with the Wheel of the Year. You could have one just because it looks cool
We could make it a Permie thing. "Oh look, they have a round calendar on the wall. They must be Permies."