Just purchased a Droid after previously owing a Blackberry. Always had problems synching my calandar and addresss book with my Blackberry and would like to know of anyone has experienced problems with the Droid.
If you had problems syncing your BlackBerry, just wait for the fun you'll have trying to figure out how to sync the Droid.
The iCal calendar will sync OK, but contacts won't really sync. Best way in my experience is to email the Mac contacts you have to your gmail account, then bring them into the Droid.