I'm using it on a home PC for my wife's Google Calendar. 2-way sync to Outlook 2003. Seems to work fine, but it's certainly not being stressed much.
I tried to use it on my work PC (1-way, download), but since you can't target a calendar, I couldn't use it. I don't mix my wife's personal events with my work events. I create a new Calendar for them and just sync that calendar. I'm currently using Remote Calendars (
http://sourceforge.net/projects/remotecalendars) to do it. I little rough interface wise, but it does the job.
John