My husband and I have been using it for about 6-8 months now I cannot remember when we started. We each have our own calendars that we enable for the other person so I can look at my schedule, his, or both. He uses his for work as well because he synchs it with his work outlook calendar, so I know when all his meetings are! :)

We also have some friends that are on it so I can temporarily add them to our calendar when planning a party to see if everyone is theoretically available. It makes things so much easier.

Now that both my parents are retired I am going to try to introduce them to it so we know where they are since they plan on traveling a bit.

I must say that I have always been partial to the calendars in my physical planners. I always have it around and I always loved actually writing things down, but with Google calendar, its all changed. It is so easy to check it since I have my email open all day and since I have family scattered everywhere, it is easy to share my calendar with them all. It really saved me a lot of time when I was in college since I could just share my calendar for group projects and now that I am out, I still use it to coordinate with my roommate.

As a long time Outlook Exchange user - it's taken me awhile to get used to Google Calendar - but the gain from being able to consolidate work and "life" calendars (and be selective about detailing who gets to see what in terms of specifics vs. a busy listings) has truly simplified scheduling for me, my work colleagues and my family.