Do yourself a favor and forget buying a crosswalk model. You are better off with a gym membership.
If you want a treadmill in the $700 range, you are much better off with a Horizon T101. They have been selling Crosswalk models for decades and we have been telling people not to buy Crosswalk models for decades. I can state unequivocally that no customer has ever refuted our claim that the Crosswalk arms don't add a bit to the workout effectiveness of the machine. As we have been saying for years, you won't get a better workout with a Crosswalk but you sure will pay for it!