Unfortunately, neither of the native Mac alternatives work properly. The freebie download from Blackberry loses calendar appointments and contacts. The purchased one (Missing Sync) overwrites data with its more limited version -- for example, if you complete some tasks, MissingSync will overwrite the Mac's completed date with a blank because it doesn't understand completion dates; it does the same for multiple e-mail addresses and phone numbers too.
You can run the PC application under a virtual machine -- but it only seems to understand Outlook not the Mac calendar, address book or tasks.
So we wait (in frustration).