I started using this product when it was in ßeta, called MySync. Mark/Space acquired this product in early 2007 and renamed it Sync Together. During the early days, I worked with Martin Redington to improve the product, and found him responsive, hard-working, and talented. Every issue I encountered and reported to him he fixed. For the past year or so, I have used Sync Together to sync Address Books and iCalendars on two different machines, and it didn't even blink when I upgraded one to Leopard.

The documentation lists the many issues surrounding synchronization between Macs. For those who are having problems, I suggest they read this information carefully. When the product has reported sync problems (and offers to resolve them in a number of ways), it's usually because I have mis-typed something, or in one case, Apple added a field to the contact list that did not exist in the older version of iCal.

This program may not be for everyone. But it does exactly what I want it to do, and thus I'm a happy camper.