If you want a fold-up elliptical, this is your only real option.
The Proform Spacesaver DX is a continuation of the Audiostrider series by Nordictrack and a carbon copy of the HealthRider H90e elliptical. The Spacesaver DX is based on the successful rear-drive/ramp design that Icon has licensed from Precor. The motion is excellent and the durability is good as well. The problem is when they add the folding feature, they also add some vibration in the frame.