Backdrop in CVS... i don't know...

I found a new option in the current cvs: backdrop in the node editor for compositing… i don’t know, for me it seems there’s too much on the node-editor-screen… i like the layout with node-editor in one window and next to it an inmage-window, which is more comfortable.
Also the alpha-value for nodes is confusing /-X
What do you think? Do you see any benefits?