MJUHL24  This app is a giant pain, which is probably due in part to the horrible BlackBerry operating system. When it works, the Missing Sync is ALMOST satisfactory, however it is horribly unstable.

I was able to sync my address book, calendar, and (most of) my iTunes library a few times. Unfortunately, the app on my phone STOPPED WORKING altogether. Whenever I try to start it my BlackBerry FREEZES for several minutes, then finally tells me this:

'Uncaught exception: Application MissingSync(184) is not responding; process terminated

Sadly, I was expecting this sort of garbage after reading reviews of the app. To me, it was worth the $40 and frustration to get my music on my phone.  
(Version 2.0.2)