I'd say that's a fair deal, especially with the monitor and everything else!
Later ROM revisions are usually associated with bug fixes and some minor hardware revisions, it'd be nice to have an extensive list of what has been fixed but I wonder if that information has ever been made public by Apple. 
If you're interested in getting more details, here you can find a rather exhaustive list of what's been changed from earlier to newer revisions; I don't know if that information is complete or "Apple certified" in any way, but it seems like a good place to start from anyway!