I've updated to GS0F myself...
Works fine so far...
If u're drive isn't hacked from a 451s, then you shouldn't have any issues at all.
If it is hacked...make sure you hack the firmware executable before updating.
There are 1 or 2 threads on the quality of the new firmware update. Looks good so far.
But...if u aren't having any issues and are happy with the quality of u're burns, there really aren't any real reasons to update.
(I've lost count of the number of times i've trashed my pc optimizing and updating the newest firmwarez and drivers)
The newer updates pretty much involve better media matching. I'm assuming that u're not having problems with the current media u're using.
Me...i like to test and mess around with different media and stuff....only reason i updated.