Why ride one of those things?
For those of us who have artificial knees and miss running, ElliptiGO provides similar cardio in the wonderful "It's a great day to be out" rather THAN A STATIONARY MACHINE. Yes it takes patience to learn to ride fast but I now keep up with most of the bicyclists with 30% more workout and certainly better core strengthening. In terms of the quality of construction, it is excellent. My first 11R was a well used machine by previous owner and I still rode it > 100 miles weekly for over three years. I still ride it and will keep as second machine for friends. Riding 25-40 miles takes me 2-2 1/2 hours and is time well spent.