every update is (in some ways) worth it. If you are affected by the list of fixes from 10.5.5 then you should... otherwise it isn't as necessary. But it isn't that difficult to do. If you've got a little knowledge about your system and have tinkered with OS X AND read the forum posts lately about it then it won't hurt you to update.

It is normal for sound and video to not be fully supported right after an update since Apple may introduce new kexts that replace the ones modified by the hackintosh user in the past. Just make sure you save all the "special" kexts that you needed in order to get your system working to where it is now. Then you won't have a problem when you reboot back in and have to fix them.

---