You know the Dreamscene feature is just a little novelty function that will wear off in a very short time. I have 2GB of RAM and downloaded to see what the fuss is about, true it looks cool, but the fact of the matter is, is it practical and the answer is NO. For me I don't look at my desktop very often so its a waste of resources for me. The fact that its utilising my CPU as well as GPU assets constantly worries me, I put enough stress on my graphics card when I play games, I don't need extra stress when I'm doing 2D work.
For the record, dreamscene lasted 20 minutes before I took it off.