If you don't have a lot of space ... it doesn't get any better than this.
The NordicTrack SpaceSaver elliptical is as good as it gets if you want an elliptical and don't have a lot of space. The industrial design is excellent and the fold-up mechanism is ingenious. NordicTrack uses permanent magnets as the attaching mechanism. The only drawback is that they put a good bit of the money in the fold-up mechanism and took too much out of the frame - particularly the vertical support.