I walk five miles as fast as I can, using various inclines. It sucks, I hate it, But I need cardio strength. I only do it on days I don't work. I do it in my living room, with all the normal conveniences available.
Brian saying that he only used it twice, isn't necessarily a reflection of Powerball. It's usually like that with any exercise equipment. One sweat and it's "that's so boring", and back to the chocolate cake.
I got one in 2001. I keep it in my car. I use it about once or twice a month. It's a neat way to pass what would otherwise be wasted time. I usually crank it slow for some times an hour or more at a time, switching hands every 5 minutes or so.
As soon as you get it, practice starting it without the pull string. I lost mine in the first week!