I have an Eco Raptor, and what a difference it is compared to the Wodent Wheel!
LizGirl is right. My cage rattles at night. I was thinking of putting the wheel on a piece of fleece, but instead I figured I'd try hanging it. I had to make a few minor adjustments to the cage (hanging more fleece to absorb sound, putting buffers beneath the cage locks so it doesn't tap, etc.) and the only thing I find that makes noise is the sound of her nails against the trimmers.
All in all, it's a great wheel! :)