That reminds me that I have one of those, too. I use to use it, but when I moved, it got put in the basement and I just went onto different things.
I would listen to some really good music and exercise on it. I also used it for jogging inside. I couldn't afford a treadmill. And I'd put some small weights in my hands so that I could tone my arms at the same time.
I think I'll get mine out of the basement and use it when the weather gets cold and I can't exercise outside anymore. I can alternate that with my step rountines and tapes.