Google Calendar

I'm not sure what I think of the new calendar.google.com. Admittedly by its very nature it's impossible to evaluate in a day--you have to see how it performs over an extended period of time. But the sharing of calendars immediatley strikes me as a bad idea--do I really want to know what friend-so-and-so thinks is a better thing to do than hang out with me? How many times Miss X does laundry? When Buddy Joe Smith is going to his dermatologist? Do I want them to know about my movie watching habits? What a weird concept.