Is there much of a difference between Home Premium and Ultimate to merit upgrading?
End of quote
If the only thing you are looking for is Dreamscene, no it's not worth it. You would be much better off buying Object Desktop.
DeskScapes, Tweak Vista, and WindowBlinds justify the cost alone and they are just part of what Object Desktop has to offer. If you are considering purchasing, you need to do it soon to take advantage of the free upgrade to Object Desktop Ultimate when the 2008 version releases on March 31.
You can read all about Object Desktop 2008 and the free upgrade here.