I am thrilled that we finally have a decent BlackBerry syncing solution on the Mac. PocketMac was terrible, and so was Missing Sync; both have a long history of deleting and corrupting information and of randomly throwing up errors.
Admittedly, at its worst, BlackBerry Desktop Manager is no better; lots of people have been reporting these same kinds of problems with it. But at its best, it works well for syncing, and it also brings in the abilities of the Windows BDM that the other Mac syncing products have lacked: backing up and restoring your phone, and managing applications installed on it.
Before using this software, read some comments and troubleshooting tips about it on BlackBerry discussion forums. (For example, "http://forums.crackberry.com/f62/".) And then make a backup of your Mac's Address Book (export it to a file), and use this software to make a backup of your BlackBerry, so you have something to revert to if things don't go well.
When I first tried to sync, it simply errored out and said that the sync failed. But after some finagling and trial-and-error, now I've got syncs running smoothly. I'm happy with this software for now, and I hope that RIM fixes a lot of bugs in subsequent versions!