I have been using the Live weather wallpaper since day one...I don't if it is a bigger drain on the battery or not...I assume that it is BUT I am not going to skip features that I like and are available...
I have not since i got my 3D.
When I had the 4G and EPIC i would use the live water one. Showed ripples when you touched the screen. Occasionally would show a leaf falling to the surface. When i had those devices i did notice some lag and some battery drain.
Now that were talking about it, it makes me want to add it back again.