I asked this on several different forums and the general reply is that it is a piece of crap. Everyone recommended to save up and buy something better, or just run outside. Hope this helps!
I've been wanting to try one for some time. If it helps there is a long thread in the Does it Work section that gives the reviews of a lot of people who have it and love it. So far people recommend it and a movie you think has replay value to swing to.
I think I will order one. They are on sale right now on the canadian home shopping channel. $229 comes with two dvd's and has resistance pistons for when you get more advanced.
I bought a gazelle about two years ago when I was 300 lbs. It was hard when I was at my heaviest because like said above you rub on the sides. But now that I am down I like having a place to do cardio without it bothering my knees.