Sorry, but I have to play devil's advocate here.
I think PocketMac stinks. The interface is crap. Every sync pops up multiple windows with the dock icon bouncing if you dare try to do something else while it's working. It won't just sync based on time stamp - you have to sit there and babysit the application, okaying every addition/subtraction. It won't sync both work and home addresses. Sometimes it will ask to remove contacts that haven't been removed (which is probably why they want you to babysit it).
PocketMac is without a doubt the worst application I am forced to install on my Mac. Easily the least Mac-like product I've ever used.
If you want to see what a real sync product looks like, check out The Missing Sync. http://www.markspace.com/
Sadly, they don't have a product for BlackBerry, but anyone who's ever used it knows what I mean. Slick, user-friendly interface. Seamless sync services. A plethora of options when it comes to customizing your sync. My wet dream is The Missing Sync for BlackBerry.
Sorry, guys. I know that without PocketMac we'd have no other option for syncing with our Macs. So I'll give them credit for filling a need. But the product feels like a beta, at best. I mean, just look at their website. The whole thing is a mess.