I finally made the plunge to Vista 64. My Samsung S203N works great, except for one thing.
When you load a disc, generally you expect 3 things to happen:
1) icon on disc drive updates to reflect disc
2) volume label updates to reflect disc
3) right-click context menu updates to reflect type of disc
This is not happening. For example, if I boot the computer up into Vista and then put a data DVD into the drive, these things are not happening. BUT I can still open the drive and browse/use its contents.
However, if I restart the computer with a disc in the drive, it WILL show as in the drive once Windows starts. But if I then take that disc out of the drive and either replace it or just leave the drive empty, it still shows the previous disc as being in there (and its relevant context menu).
So in other words the "Computer" explorer only seems to scan once at reboot for the contents of the disc and disc type, to update the icon, volume label, and context menu. Other software (such as DVDShrink) does recognize the volume labels of newly inserted discs, even if Windows Explorer doesn't.
I've only had this drive for a week... and I don't have this issue with my 3+ year old Lite-On IDE drive if I try to use it with Vista.