It should be. We will know in just a few days time. Since the iCal data is already messed up, Erjavec's advise is spot on... uninstall Missing Sync (which is more difficult than you might think - the Mark Space website has tips, I think) and wait for RIM's Mac desktop option to hit the streets.
Once it does, the first thing I would do is a full backup of everything on the phone. From that point forward, you can experiment with different sync options until you get everything just as you want it. If something goes wrong, just restore that backup you made before you started tinkering and all is well again with the world!
Semper Fi 3/2/2
"Wow" is now overused. Therefore, I will use "Magic bananas" instead.