Do yourself a favor and remember that Keys is bankrupt before you buy one of their machines.
First and foremost remember this: I am not sold on center drive ellipticals as a design concept. This design started because several companies didn't want to license other elliptical design patents. The concept doubles the complexity of the machine. You get two drive systems for the price of one machine. You will also get, in my opinion, double the trouble over the long run. Do yourself a favor and go buy some bubble gum instead of this elliptical.