Has anyone tried treadmills?

I use mine in the winter time mostly to make up for lack of walks or on rainy, nasty days in the spring. I'll also use it if I need to take some edge off if I'm running late on a day or have to work all day then come home and I have 30mins before I have to take off with the dog somewhere. Since I can just set in front of the treadmill and put makeup on or get dressed.





And this is a video of my old dog running on his treadmill. Video is sideways but you get the point.
http://pets.webshots.com/video/3014214380055654826TReMOa