I need your advice on SmartSync Pro

I'm looking for advice for a product that would combine two types of technology. The first technology would be a PC-to-PC Synchronization. I need a program that can compare the files and synchronize them.

Second, I'm looking for a good backup tool to backup my desktop. My desktop has a local store of music, installation software and business projects. I want to be able to set these up to automatically backup to an external firewire drive.

I have just started to use SmartSync Pro (www.smsync.com), a product that I ran across after reading a review on it in the Wall Street Journal. It works great, but I am not sure if it is the ideal solution.

Suggestions? What do you like in SmartSync Pro and similar programs? What don't you like?