I have used this style of calendar for a few years, and have found it very useful indeed. Each day is split into 3 columns - His, Hers and Theirs. It is so easy to keep a track on what's going on for both my husband and myself. The 'Theirs' column is good for putting things and also Birthdays and when the bins are due to be emptied!! Excellent buy.
This is ideal for our house. Makes it so much easier to keep on top of everything from mine and the hubby's events/shifts to the kids parties/hosp appointments. Would defo recommend if you and the family have a busy lifestyle.