I hate mine.
I think it's one of those things where people who love it are either just starting out or want to be distracted from the fact they are doing exercise by the video game aspect of it. But I found those two things frustrating. It drove me crazy that I couldn't just step as many minutes as I wanted to but had to "unlock" higher and higher levels, for example. Plus what they call jogging is nothing like really running. I could do it forever at a time when I couldn't run more than 5 min. at a time.
I'm only posting this so people who think like me will be warned. I know a lot of people love it and that's fine with me, but I know I'm not the only one who found it frustrating either.